The .300 Whisper is a CIP standard cartridge in the Whisper family, a group of cartridges developed in the early 1990s by J.D. Jones of SSK Industries. It was developed as a multi-purpose cartridge, capable of utilizing relatively lightweight bullets at supersonic velocities as well as heavier bullets (200–250 grains) at subsonic velocities.
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| - .300 Whisper (en)
- .300 Whisper (fr)
- .300 Whisper (pt)
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| - Le calibre .300 Whisper, connue aussi sous le nom de .300 Fireball ou .300-221, est une cartouche désignée pour tirer des balles lourdes (200-250 grains) à vitesse subsonique. (fr)
- O .300 Whisper também conhecido como .300 Fireball ou .300-221, um cartucho padrão C.I.P., é um dos muitos cartuchos projetados para disparar balas mais pesadas (200-250 grãos) em velocidades subsônicas. Hoje em dia, o .300 AAC Blackout é o cartucho de calibre .30 mais bem-sucedido, com esses parâmetros de design e foi amplamente aceito. Convém lembrar que armas projetadas para o .300 Whisper podem disparar com segurança o .300 AAC Blackout, já o contrário, não é possível. (pt)
- The .300 Whisper is a CIP standard cartridge in the Whisper family, a group of cartridges developed in the early 1990s by J.D. Jones of SSK Industries. It was developed as a multi-purpose cartridge, capable of utilizing relatively lightweight bullets at supersonic velocities as well as heavier bullets (200–250 grains) at subsonic velocities. (en)
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| - The .300 Whisper, displayed center. (en)
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| - The .300 Whisper is a CIP standard cartridge in the Whisper family, a group of cartridges developed in the early 1990s by J.D. Jones of SSK Industries. It was developed as a multi-purpose cartridge, capable of utilizing relatively lightweight bullets at supersonic velocities as well as heavier bullets (200–250 grains) at subsonic velocities. .300 Whisper is also sometimes known as .300 Fireball or .300-221, but the .300 Whisper is a CIP cartridge and other names are generally known as wildcat cartridges. When compared to .300 AAC Blackout this sentence from Steve Johnson’s article in American Hunter sums it up best, “Given the fact that major manufacturers such as Hornady are building ammunition headstamped .300 Whisper and recommending it for use in either platform—in addition to producing reloading dies that are marked “300 Whisper/Blackout” and Smith & Wesson stamps the barrel of its M&P-15 Whisper barrels with: “300 Whisper/300 AAC Blackout” it is safe to say that differences are minimal. “. CIP has specifications for both .300 Whisper and .300 Blackout cartridges that are very similar, though all manufactures will recommend using the correct ammunition with the correct firearm. (en)
- Le calibre .300 Whisper, connue aussi sous le nom de .300 Fireball ou .300-221, est une cartouche désignée pour tirer des balles lourdes (200-250 grains) à vitesse subsonique. (fr)
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