From Surf Wiki (app.surf) — the open knowledge base

Winchester Short Magnum

Family of rifle cartridges

Winchester Short Magnum, or WSM, refers to a family of rebated bottlenecked centerfire short magnum cartridges developed in the early 2000s by the U.S. Repeating Arms Company, the maker of Winchester rifles and one of the oldest firearms manufacturers in the United States. 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).

It was developed by Rick Jamison in 1997-1998 as shown in the 2003 lawsuit Jamison vs. Olin Corporation-Winchester division. Jamison was given 7 patents on the cartridge design. U.S. Repeating Arms Company used the same concept and the same base case in creating its even shorter Winchester Super Short Magnum cartridges, three of which were introduced in 2003 and 2004.

Influences

The .300 Winchester Short Magnum demonstrates the accuracy of its name when compared to the .300 Winchester Magnum.

7.82 Lazzeroni Patriot

The WSM family was inspired partially by a family of proprietary short magnum cartridges developed in late 1997,John Lazzeroni comments on rec.guns by John Lazzeroni, derived from a previous line of magnum cartridges he had created. The first Lazzeroni short magnum, the 7.82 Lazzeroni Patriot, was designed to operate in a short-action rifle, instead of requiring a long action. The U.S. Repeating Arms Company was the first major manufacturer to commercialize Lazzeroni's concept, followed shortly thereafter by Remington with their "Short Action Ultra Mag" line.

6 mm Benchrest

Another influence was a series of 6 mm cartridges developed for bench-rest target shooting competitions in the 1970s. The idea behind these cartridges was that a short, fat cartridge would be more "efficient" than the traditional long, narrow cartridge, as more of the powder column would be in the immediate vicinity of the primer as it detonated. In turn, this would mean that a cartridge of this type would be able to propel a bullet at speeds comparable to those of "magnum" cartridges of the same caliber using significantly less powder.

Dimensions

The dimensions of the basic case are:

Rim diameter (at base): .535 in. (13.59 mm)
Outside diameter (at base): .555 in. (14.10 mm)
Inside diameter (of case): .538 in. (13.67 mm)
Maximum case length: 2.10 in. (53.34 mm)

The WSM family of cartridges are Delta L problem cartridges, meaning they can present unexpected chambering and/or feeding problems.

Variants

The 300 WSM was the first of the new class of short magnums to see wide use. All of the WSM cartridges released to date have proven popular for thin-skinned game up to the size of elk and African plains game, the .325 WSM being an excellent cartridge for elk, bison and similar big game.

The cartridges in this family are, in order of development:

Name	Year of development	Bullet diameter
[300 WSM](300-winchester-short-magnum)	2001	.308 in. (7.823 mm)
[7 mm WSM](7mm-winchester-short-magnum)	2002	.284 in. (7.214 mm)
[270 WSM](270-winchester-short-magnum)	2002	.277 in. (7.036 mm)
[325 WSM](325-winchester-short-magnum)	2005	.323 in. (8.204 mm)

References

[https://www.shootingtimes.com/editorial/the-300-winchester-short-magnum/329810 The .300 Winchester Short Magnum, Allan Jones - December 18, 2018, www.shootingtimes.com]
"Lexis® - Sign In {{!}} LexisNexis".

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

cartridge-families winchester-repeating-arms-company-firearms winchester-short-magnum-rifle-cartridges

Want to explore this topic further?

Ask Mako anything about Winchester Short Magnum — get instant answers, deeper analysis, and related topics.

Research with Mako

Free with your Surf account

Content sourced from Wikipedia, available under CC BY-SA 4.0.

This content may have been generated or modified by AI. CloudSurf Software LLC is not responsible for the accuracy, completeness, or reliability of AI-generated content. Always verify important information from primary sources.

Report