Why All 300 Winchester Magnums Same Length
Why All 300 Winchester Magnums Same Length?
Why are 300 Winchester Magnums with 150-grain bullets the same length as 300 Winchester Magnums with 220-grain bullets? And why aren’t all bullets accurate in all rifles?
Regardless of bullet type and length, all 300 Winchester Magnum cartridges, like all other factory loaded cartridges, are built to a standard length in order to fit a variety of rifle actions, magazines, and chambers.
- The bullet is just one part of the cartridge. Like an iceberg, most of it is hidden underwater (inside the brass case.)
- Cartridge overall length (COL) is standardized so all brands of ammo fit all makes of rifles.
- A barrel’s rifling twist must be fast enough to spin stabilize bullets. The longer the bullet, the faster the twist must be. This article explains the gruesome details. The Q and A below explains why ammunition for all 300 Winchester Magnums is the same length.
Reader Asks “Why Are 300 Winchester Magnums 200-grain Bullets The Same Length As 150-grain Bullets?”
A reader recently wrote: “Ron, I have a Ruger M77 Mark II in 300 Win Mag with 1:10 twist. It stabilizes a 200 gr Hornady ELD-X bullet but it is not accurate. But it is quite accurate with 150 grain Federal Fusion. The bullets are the same length. Why is this so?”
It took me a few seconds to realize he was confusing cartridge length with bullet length. His confusion is due, in part, to our culture’s casual, colloquial references to cartridges as “bullets.” Cartoon character Elmer Fudd stopped shooting at Bugs Bunny once and said “Out of bullets.” (“Buwwets” in Fudd-speak.) News reporters often reference “live bullets found on the scene,” and “handguns that hold up to 17 bullets!” What they mean, of course, is that live cartridges were found on the scene and that handguns hold up to 17 cartridges. Bullets are a critical part of those cartridges, of course, but only a part. Calling a complete cartridge a “bullet” results in the kind of confusion befuddling our reader above.
Nosler’s Reloading Guide 7 shows standard dimensions for all 300 Winchester Magnums, including Cartridge Overall Length at 3.340 inches.
Parts Are Parts, and It Takes Several to Make Any Cartridge
At the risk of belaboring the obvious for many of you, let’s review what a centerfire cartridge consists of, then explain how this relates to accuracy:
1. A metallic case, usually brass. This is the “container” that holds the powder, the primer for igniting that powder, and the bullet the powder pushes from the barrel once the chemical reaction, sparked by ignition of high temperature primer powder, converts the solid gunpowder to a gas.
2. The primer. This is a tiny cup of thin metal, usually copper, containing compounds hyper-sensitive to sudden concussive strikes. It is inserted into a small cavity in the base of the cartridge called the primer pocket. When a firing pin strikes this primer cup, it squeezes the metal against an internal triangle of metal called an “anvil.” The compound crushed between these metals then ignites, shooting a tiny but extremely hot flame through a flash hole in the case head. This raises the temperature of the main powder charge, causing it to oxidize (burn.) The primer is the modern equivalent of the flint and pan on an old flintlock muzzleloader.
The components that make up a brass, centerfire rifle cartridge include primer, powder, bullet, and case shown here in a 308 Winchester.
3. The powder. Smokeless gunpowder is a nitrocellulose formulation of flakes, tiny discs, or short, thin, extruded cylinders or pellets that look a lot like pieces of pencil lead (graphite.) These are coated with various chemicals to enhance or slow the rate at which they burn. Extruded pellets can include holes as another method for controlling burn rate. When smokeless powder is ignited, it is converted into a gas which fills up much, much, mush more space than the powder did. Since this rapidly expanding gas is confined within the chamber and narrow barrel of the gun, it creates incredible pressures that seek release. Ideally this is achieved by following the path of least resistance — pushing the bullet out of the muzzle.
4. The bullet. Here is the projectile for which all these other components have been assembled. The bullet can be a simple round ball, an elongated cylinder, or a modern, sleek, tapered bullet maximized to minimize air drag and fly a long way. The bullet is pressed very tightly into the mouth or neck of the metallic cartridge case, and this is where our reader’s confusion arises — bullet seating depth.
An empty 300 Winchester Magnums case beside a variety of bullet types and weights shows how cartridge overall length remains constant, but longer bullets protrude deeper into the case (powder space.)
300 Winchester Magnums Require Standard Cartridge Length to Fit All Rifles
Because bullets can vary significantly in weight and shape, they vary significantly in length. But, because cartridges must be standardized to fit within the magazines and barrel chambers of many, many different rifles, the industry establishes something called Cartridge Overall Length (COL.) This is the maximum length the cartridge cannot exceed in order for it to properly fit all these various rifle actions, chambers and magazines. It is measured from the cartridge base to the tip of any bullet pushed into its neck.
Mechanical function (feeding, firing, etc.) is not compromised by any part of the bullet held inside the case, so manufacturers seat bullets as deeply as necessary to match COL. Short bullets might have half their length inside the neck of the case. Longer bullets might have three-quarters their length poking into the powder reservoir behind the neck. Regardless how long the bullet actually is, only a small portion of it will be visible. This is why our reader’s loaded cartridges measured the same from base to bullet tip with both 150-grain and 200-grain bullets.
Bullets that fit 300 Winchester Magnums come in varying lengths, but all are pushed into the cartridge case to establish a standard COL.
300 Winchester Magnums’ Bullet Length Impacts Accuracy
As for the reader’s accuracy issue: the longer the bullet, the faster it must spin in order to stabilize. Rifle barrels are cut or formed with twisting grooves (rifling) at rates common to specific cartridges. A common rifling twist rate for many 30-caliber cartridges is one complete turn in ten inches of barrel length (1-10″.) Most twist rates were established in the 20th century before extremely long, sharply tipped, boat tailed bullets existed. As a result, your 270 Win., 30-06 Springfield, 243 Win. or 25-06 Rem., etc. may not twist quite fast enough to stabilize some of today’s long, heavy, high B.C. bullets. If your rifle shoots light bullets accurately, but extremely heavy bullet inaccurately, they could be spinning near the ragged edge of stability. If you notice holes in your paper targets that are slightly oblong or egg shaped, the bullets that punched them were poorly stabilized.
Cutaway of a rifle barrel shows how 300 Winchester Magnums with bullets seated too long will not seat completely in the chamber because the bullet jams against the rifling. Bullets of excessive length will not be stabilized if the rifling does not twist quickly enough. This one makes a complete turn in 10 inches.
This doesn’t mean your rifle barrel can’t stabilize all heavy bullets, just long ones. A 1-10” twist rate, for instance, might not stabilize a 220-grain VLD bullet, but could stabilize a 220-grain round nose bullet because the round nose concentrates is mass within a shorter length. It’s the length that requires increased twist rate, not the weight. Similarly, if Nosler made a 200-grain, all-copper E-Tip bullet in .308″, a 1-10″ twist wouldn’t stabilize it. Because copper’s specific gravity (density) is so much lighter than lead, the bullet would have to be much longer than a 200-grain lead core bullet.
Like many serious rifle shooters in the 21st century, Ron Spomer appreciates the ballistic benefits of long, high B.C. bullets. He hopes that rifle manufacturers will soon begin offering faster twist barrels in many popular chamberings.
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Применение на охоте
На охоте патрон .300 Winchester Magnum используется там, где нужна точная стрельба на большие расстояния. Для охотников также представляет интерес высокая поражающая способность пули этого патрона на коротких дистанциях. Дульная энергия пули этого патрона — 4,3…4,8 кДж примерно равна энергии пуль таких крупнокалиберных охотничьих патронов, как 9,3×62 мм, но при стрельбе на дальность 0-150 м пуля .300 Winchester Magnum оказывает при попадании ещё и сильное фугасное действие благодаря своей высокой скорости. Поэтому её убойная сила, несмотря на сравнительно малый вес, весьма велика и позволяет с успехом поражать даже крупную дичь.
В Европе, Северной Америке и России .300 Winchester Magnum хорошо подходит для охоты на дичь весом до 350 кг [3] — кабана, крупных оленей, лося и не очень крупного медведя. На Африканских охотничьих сафари он хорошо «работает» по всем средним и крупным копытным размером меньше буйвола — особенно на открытых пространствах саванны, где стрельба ведётся на 200—300 м, — а также по крокодилу и т. д. Он также очень хорош для горных охот, поскольку именно в горах требуется стрельба на большие расстояния.
Для стрельбы по мелкой дичи (в Северном полушарии — косуля, небольшой кабан, мелкие олени и т. д., в Африке — все небольшие антилопы) патрон .300 Winchester Magnum подходит плохо, так как его высокоскоростные пули на коротких дистанциях сильно рвут тушу. Не годится он и для «большой пятёрки» (кроме, может быть, леопарда) — его мощность для крупных толстокожих зверей или льва всё же недостаточна, особенно, если может возникнуть необходимость стрельбы накоротке [3] .
.300 Winchester Magnum — один из самых популярных патронов для варминтинга — особой стрелковой дисциплины и разновидности спортивной охоты (стрельба на большие дистанции из специального оружия).
Пули для этого патрона используются те же, что и для других патронов калибра 7,62 мм. Сейчас патрон .300 Winchester Magnum, равно как и оружие под него, выпускается всеми ведущими оружейными фирмами. Цена одного патрона — 5-6 долл.
- 1 Технические характеристики
- 2 Использование
- 3 предупреждения
- 3.1 Начальная скорость пули
- 4 Сравнение
- 5 См. Также
- 6 Ссылки
- 7 Внешние ссылки
Общая длина патрона составляет 72,6 мм, длина гильзы – 53,34 мм, а диаметр пули – .308 дюйма (7,62 мм), что является общим для всех патронов американского калибра .30. Принцип, действующий в коротком патроне Magnum, заключается в том, что большие объемы пороха помещаются ближе к пламенному отверстию капсюля, что приводит к более равномерному и последовательному воспламенению. .300 WSM имеет емкость 80 гран H2O. Модель 30-06 Springfield имеет 69 гран H2O, 308 Winchester 56 гран H2O, а модель 30-30 Winchester с емкостью корпуса 45 гран H2O. 300 Winchester Magnum имеет корпус H2O емкостью 93,8 гран. С этим аспектом почти идентичным характеристикам 300 Winchester Magnum, .300 WSM делает это с примерно на 14 гран меньше пороха позади своей пули. Это демонстрирует очевидную превосходную конструкцию .300 WSM. У .300 WSM также есть свободное пространство над плечом кейса по сравнению с более старым 300 Winchester Magnum, оснащенным поясом для головы.
Преимущество этого патрона состоит в том, что баллистика почти идентична баллистике .300 Winchester Magnum , но в более легкой винтовке с более коротким ходом горит на 8-10% меньше пороха. Недостаток конструкций гильзы с относительно большим диаметром головки гильзы заключается в относительно высоком уровне тяги затвора, оказываемой на запирающий механизм используемого огнестрельного оружия. Также при малых кольцевых затворах больший диаметр патронника удаляет больше стали из шипа ствола, делая его слабее в радиальном направлении.
- Super-X has proven accuracy
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Применение в военном деле
Патрон достаточно широко используется в снайперском оружии стран НАТО и государств, приобретающих вооружение у стран НАТО. Его применение обеспечивает эффективную дальность снайперского огня до 1100…1200 м. [4]
Из известных систем оружия под патрон .300 Winchester Magnum можно назвать следующие:
— Одна из модификаций американской снайперской винтовки М24, которая идёт и на экспорт. Для неё этот патрон был принят в 2009 году.
— Американская винтовка М86.
— Американская винтовка Mk.13, состоящая на вооружении ВМС США.
— Модификация британской снайперской винтовки Accuracy International AWM, состоящая на вооружении Бундесвера.
— Немецкая винтовка Walther WA 2000.
Снаряжаем .300 Winchester Magnum
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О внесении изменений в Федеральный закон «Об оружии»
Принят Государственной Думой 10 июля 2018 года
Статья 1
Внести в Федеральный закон от 13 декабря 1996 года № 150-ФЗ
«Об оружии» (Собрание законодательства Российской Федерации, 1996, № 51, ст. 5681; 2001, № 31, ст. 3171; 2009, № 7, ст. 770; № 30, ст. 3775; 2010, № 14, ст. 1554, 1555; № 23, ст. 2793; 2011, № 1, ст. 10; № 30, ст. 4596; № 50, ст. 7351; 2012, № 29, ст. 3993; 2013, № 27, ст. 3477; 2014, № 14,
ст. 1555; № 30, ст. 4228; 2015, № 1, ст. 76; № 29, ст. 4356; 2016, № 1, ст. 28; № 15, ст. 2066; № 27, ст. 4160; № 28, ст. 4558; 2017, № 31, ст. 4817; № 50, ст. 7562) следующие изменения:
1) часть первую статьи 1 дополнить абзацем следующего содержания:
«самостоятельное снаряжение патронов к гражданскому огнестрельному длинноствольному оружию – самостоятельная сборка патронов для личного использования гражданами, являющимися владельцами охотничьего огнестрельного длинноствольного оружия и (или) спортивного огнестрельного длинноствольного оружия.»;
2) статью 6 дополнить пунктом 12 следующего содержания:
«12) продажа или передача инициирующих и воспламеняющих веществ и материалов (пороха, капсюлей) для самостоятельного снаряжения патронов к гражданскому огнестрельному длинноствольному оружию гражданам, не имеющим разрешения на хранение и ношение такого оружия.»;
3) часть семнадцатую статьи 13 дополнить новым вторым предложением следующего содержания: «Граждане Российской Федерации, впервые приобретающие охотничье огнестрельное длинноствольное оружие или спортивное огнестрельное длинноствольное оружие, за исключением граждан, имеющих разрешение на хранение или хранение и ношение огнестрельного оружия, граждан, проходящих службу в государственных военизированных организациях и имеющих воинские звания либо специальные звания или классные чины юстиции либо уволенных из этих организаций с правом на пенсию, при изучении правил безопасного обращения с оружием и приобретении навыков безопасного обращения с оружием обязаны пройти обучение безопасному самостоятельному снаряжению патронов к гражданскому огнестрельному длинноствольному оружию.»;
4) в статье 16:
а) наименование изложить в следующей редакции:
«Статья 16. Производство оружия и патронов к нему. Самостоятельное снаряжение патронов к гражданскому огнестрельному длинноствольному оружию»;
б) в части четвертой первое предложение изложить в следующей редакции: «Граждане Российской Федерации, являющиеся владельцами гражданского огнестрельного длинноствольного оружия, при наличии разрешения на хранение и ношение данного оружия вправе для личного использования производить самостоятельное снаряжение патронов к указанному оружию.»;
5) в статье 18:
а) абзац пятый части второй изложить в следующей редакции:
«обеспечивать учет приобретаемых и продаваемых оружия, патронов, инициирующих и воспламеняющих веществ и материалов (пороха, капсюлей) для самостоятельного снаряжения патронов к гражданскому огнестрельному длинноствольному оружию, а также хранение учетной документации в течение 10 лет;»;
б) часть четвертую изложить в следующей редакции:
«Запрещается продавать гражданское и служебное оружие юридическим лицам, не представившим лицензию на приобретение указанного оружия, а патроны к нему – юридическим лицам, не представившим разрешения на хранение или хранение и ношение указанного оружия. Запрещается продавать оружие гражданам, не представившим лицензию на приобретение соответствующего вида оружия, патроны к нему – гражданам, не представившим разрешения на хранение или хранение и ношение такого оружия, за исключением тех видов оружия и патронов к нему, на приобретение которых лицензия не требуется. Запрещается продавать инициирующие и воспламеняющие вещества и материалы (порох, капсюли) для самостоятельного снаряжения патронов к гражданскому огнестрельному длинноствольному оружию либо для заряжания оружия, имеющего культурную ценность, копий старинного (антикварного) огнестрельного оружия и реплик старинного (антикварного) огнестрельного оружия гражданам, не представившим разрешение на хранение и ношение гражданского огнестрельного длинноствольного оружия. Не подлежат продаже вещества и материалы для самостоятельного снаряжения патронов к гражданскому огнестрельному длинноствольному оружию, упаковка которых не содержит сведений о правилах их безопасного использования для самостоятельного снаряжения патронов к гражданскому огнестрельному длинноствольному оружию.»;
6) часть шестую статьи 22 после слов «патронов к нему» дополнить словами «, а также инициирующих и воспламеняющих веществ и материалов (пороха, капсюлей) для самостоятельного снаряжения патронов к гражданскому огнестрельному длинноствольному оружию».
Статья 2
Граждане Российской Федерации, которым до дня вступления в силу настоящего Федерального закона выданы разрешения на хранение и ношение гражданского огнестрельного длинноствольного оружия, вправе для личного использования производить самостоятельное снаряжение патронов к такому оружию без прохождения обучения безопасному самостоятельному снаряжению патронов к гражданскому огнестрельному длинноствольному оружию.
Статья 3
Настоящий Федеральный закон вступает в силу по истечении ста восьмидесяти дней после дня его официального опубликования.
Президент
Российской Федерации В.Путин
Мучаюсь выбором, какую взять?
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1. LYMAN – BLEACHER LOADING BLOCKS
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Why All 300 Winchester Magnums Same Length?
Why are 300 Winchester Magnums with 150-grain bullets the same length as 300 Winchester Magnums with 220-grain bullets? And why aren’t all bullets accurate in all rifles?
Regardless of bullet type and length, all 300 Winchester Magnum cartridges, like all other factory loaded cartridges, are built to a standard length in order to fit a variety of rifle actions, magazines, and chambers.
- The bullet is just one part of the cartridge. Like an iceberg, most of it is hidden underwater (inside the brass case.)
- Cartridge overall length (COL) is standardized so all brands of ammo fit all makes of rifles.
- A barrel’s rifling twist must be fast enough to spin stabilize bullets. The longer the bullet, the faster the twist must be. This article explains the gruesome details. The Q and A below explains why ammunition for all 300 Winchester Magnums is the same length.
Reader Asks “Why Are 300 Winchester Magnums 200-grain Bullets The Same Length As 150-grain Bullets?”
A reader recently wrote: “Ron, I have a Ruger M77 Mark II in 300 Win Mag with 1:10 twist. It stabilizes a 200 gr Hornady ELD-X bullet but it is not accurate. But it is quite accurate with 150 grain Federal Fusion. The bullets are the same length. Why is this so?”
It took me a few seconds to realize he was confusing cartridge length with bullet length. His confusion is due, in part, to our culture’s casual, colloquial references to cartridges as “bullets.” Cartoon character Elmer Fudd stopped shooting at Bugs Bunny once and said “Out of bullets.” (“Buwwets” in Fudd-speak.) News reporters often reference “live bullets found on the scene,” and “handguns that hold up to 17 bullets!” What they mean, of course, is that live cartridges were found on the scene and that handguns hold up to 17 cartridges. Bullets are a critical part of those cartridges, of course, but only a part. Calling a complete cartridge a “bullet” results in the kind of confusion befuddling our reader above.
Nosler’s Reloading Guide 7 shows standard dimensions for all 300 Winchester Magnums, including Cartridge Overall Length at 3.340 inches.
Parts Are Parts, and It Takes Several to Make Any Cartridge
At the risk of belaboring the obvious for many of you, let’s review what a centerfire cartridge consists of, then explain how this relates to accuracy:
1. A metallic case, usually brass. This is the “container” that holds the powder, the primer for igniting that powder, and the bullet the powder pushes from the barrel once the chemical reaction, sparked by ignition of high temperature primer powder, converts the solid gunpowder to a gas.
2. The primer. This is a tiny cup of thin metal, usually copper, containing compounds hyper-sensitive to sudden concussive strikes. It is inserted into a small cavity in the base of the cartridge called the primer pocket. When a firing pin strikes this primer cup, it squeezes the metal against an internal triangle of metal called an “anvil.” The compound crushed between these metals then ignites, shooting a tiny but extremely hot flame through a flash hole in the case head. This raises the temperature of the main powder charge, causing it to oxidize (burn.) The primer is the modern equivalent of the flint and pan on an old flintlock muzzleloader.
The components that make up a brass, centerfire rifle cartridge include primer, powder, bullet, and case shown here in a 308 Winchester.
3. The powder. Smokeless gunpowder is a nitrocellulose formulation of flakes, tiny discs, or short, thin, extruded cylinders or pellets that look a lot like pieces of pencil lead (graphite.) These are coated with various chemicals to enhance or slow the rate at which they burn. Extruded pellets can include holes as another method for controlling burn rate. When smokeless powder is ignited, it is converted into a gas which fills up much, much, mush more space than the powder did. Since this rapidly expanding gas is confined within the chamber and narrow barrel of the gun, it creates incredible pressures that seek release. Ideally this is achieved by following the path of least resistance — pushing the bullet out of the muzzle.
4. The bullet. Here is the projectile for which all these other components have been assembled. The bullet can be a simple round ball, an elongated cylinder, or a modern, sleek, tapered bullet maximized to minimize air drag and fly a long way. The bullet is pressed very tightly into the mouth or neck of the metallic cartridge case, and this is where our reader’s confusion arises — bullet seating depth.
An empty 300 Winchester Magnums case beside a variety of bullet types and weights shows how cartridge overall length remains constant, but longer bullets protrude deeper into the case (powder space.)
300 Winchester Magnums Require Standard Cartridge Length to Fit All Rifles
Because bullets can vary significantly in weight and shape, they vary significantly in length. But, because cartridges must be standardized to fit within the magazines and barrel chambers of many, many different rifles, the industry establishes something called Cartridge Overall Length (COL.) This is the maximum length the cartridge cannot exceed in order for it to properly fit all these various rifle actions, chambers and magazines. It is measured from the cartridge base to the tip of any bullet pushed into its neck.
Mechanical function (feeding, firing, etc.) is not compromised by any part of the bullet held inside the case, so manufacturers seat bullets as deeply as necessary to match COL. Short bullets might have half their length inside the neck of the case. Longer bullets might have three-quarters their length poking into the powder reservoir behind the neck. Regardless how long the bullet actually is, only a small portion of it will be visible. This is why our reader’s loaded cartridges measured the same from base to bullet tip with both 150-grain and 200-grain bullets.
Bullets that fit 300 Winchester Magnums come in varying lengths, but all are pushed into the cartridge case to establish a standard COL.
300 Winchester Magnums’ Bullet Length Impacts Accuracy
As for the reader’s accuracy issue: the longer the bullet, the faster it must spin in order to stabilize. Rifle barrels are cut or formed with twisting grooves (rifling) at rates common to specific cartridges. A common rifling twist rate for many 30-caliber cartridges is one complete turn in ten inches of barrel length (1-10″.) Most twist rates were established in the 20th century before extremely long, sharply tipped, boat tailed bullets existed. As a result, your 270 Win., 30-06 Springfield, 243 Win. or 25-06 Rem., etc. may not twist quite fast enough to stabilize some of today’s long, heavy, high B.C. bullets. If your rifle shoots light bullets accurately, but extremely heavy bullet inaccurately, they could be spinning near the ragged edge of stability. If you notice holes in your paper targets that are slightly oblong or egg shaped, the bullets that punched them were poorly stabilized.
Cutaway of a rifle barrel shows how 300 Winchester Magnums with bullets seated too long will not seat completely in the chamber because the bullet jams against the rifling. Bullets of excessive length will not be stabilized if the rifling does not twist quickly enough. This one makes a complete turn in 10 inches.
This doesn’t mean your rifle barrel can’t stabilize all heavy bullets, just long ones. A 1-10” twist rate, for instance, might not stabilize a 220-grain VLD bullet, but could stabilize a 220-grain round nose bullet because the round nose concentrates is mass within a shorter length. It’s the length that requires increased twist rate, not the weight. Similarly, if Nosler made a 200-grain, all-copper E-Tip bullet in .308″, a 1-10″ twist wouldn’t stabilize it. Because copper’s specific gravity (density) is so much lighter than lead, the bullet would have to be much longer than a 200-grain lead core bullet.
Like many serious rifle shooters in the 21st century, Ron Spomer appreciates the ballistic benefits of long, high B.C. bullets. He hopes that rifle manufacturers will soon begin offering faster twist barrels in many popular chamberings.
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- 1 Технические характеристики
- 2 Использование
- 3 предупреждения
- 3.1 Начальная скорость пули
- 4 Сравнение
- 5 См. Также
- 6 Ссылки
- 7 Внешние ссылки
Общая длина патрона составляет 72,6 мм, длина гильзы – 53,34 мм, а диаметр пули – .308 дюйма (7,62 мм), что является общим для всех патронов американского калибра .30. Принцип, действующий в коротком патроне Magnum, заключается в том, что большие объемы пороха помещаются ближе к пламенному отверстию капсюля, что приводит к более равномерному и последовательному воспламенению. .300 WSM имеет емкость 80 гран H2O. Модель 30-06 Springfield имеет 69 гран H2O, 308 Winchester 56 гран H2O, а модель 30-30 Winchester с емкостью корпуса 45 гран H2O. 300 Winchester Magnum имеет корпус H2O емкостью 93,8 гран. С этим аспектом почти идентичным характеристикам 300 Winchester Magnum, .300 WSM делает это с примерно на 14 гран меньше пороха позади своей пули. Это демонстрирует очевидную превосходную конструкцию .300 WSM. У .300 WSM также есть свободное пространство над плечом кейса по сравнению с более старым 300 Winchester Magnum, оснащенным поясом для головы.
Преимущество этого патрона состоит в том, что баллистика почти идентична баллистике .300 Winchester Magnum , но в более легкой винтовке с более коротким ходом горит на 8-10% меньше пороха. Недостаток конструкций гильзы с относительно большим диаметром головки гильзы заключается в относительно высоком уровне тяги затвора, оказываемой на запирающий механизм используемого огнестрельного оружия. Также при малых кольцевых затворах больший диаметр патронника удаляет больше стали из шипа ствола, делая его слабее в радиальном направлении.