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A magnum cartridge is a firearm cartridge with a larger case size than, or derived from, a similar cartridge of the same projectile caliber and case shoulder shape. [ clarification needed ] The term derives from the .357 Magnum , the original revolver cartridge with this designation.
All of the WSM cartridges are inspired on the .404 Jeffery non-belted magnum cartridge which is shortened to fit a short rifle action (such as a .308 Winchester). [1] It was developed by Rick Jamison in 1997-1998 as proven in a 2005 lawsuit Jamison vs. Olin Corporation-Winchester division. [2] Jamison was given 7 patents on the cartridge design.
Based on the .416 Rigby case, it is a non-belted and bottlenecked cartridge. Earlier J. D. Jones had already developed the similar .500 Whisper round, which has a roughly .4 in (10 mm) longer belted bottlenecked case based on the .378 Weatherby Magnum.
Remington Ultra Magnum, or RUM, refers to a "family" of cartridges developed between 1999 and 2002 by Remington Arms. [1] All of the RUM cartridges are based on the .404 Jeffery non-belted magnum cartridge.
The first major departure from the classic Weatherby design was the 6.5 Weatherby Rebated Precision Magnum (often abbreviated as RPM), a non-belted cartridge with an angled shoulder and no freebore introduced in 2019. [12] In 2022, a second cartridge in the RPM family, the .338 Weatherby RPM, was introduced, again with no belt and an angled ...
The resulting case has significantly more capacity than any conventional belted magnum. Compared to the 7mm Remington Magnum, top 7mm RUM loads deliver 25% more energy at 300 yards. [citation needed] Such performance demands a price and in this case, that is a large muzzle blast, sharp recoil and short barrel life. [1]
Non-shouldered (non-"bottlenecked") magnum rifle cartridges especially could be pushed too far into the chamber and thus cause catastrophic failure of the gun when fired with excessive headspace. The addition of the belt to the casing prevented over-insertion, while allowing smoother feeding from a box magazine compared to a rimmed cartridge.
As such, it allows heavier .338 caliber bullets to be used from the .30-06 non-belted case. This can be a suitable choice for heavy bodied game such as moose, elk, and brown bear. The number and variety of .338 caliber bullets increased after the introduction in the late 1950s of the .338 Winchester Magnum cartridge, frequently chambered in the ...