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The Basics, Starting Out
WSM vs Magnums
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<blockquote data-quote="johnnyk" data-source="post: 399245" data-attributes="member: 307"><p>The term belted magnum refers to any caliber cartridge, generally rifles, using a shell casing with a pronounced "belt" around its base that continues 2-4mm past the extractor groove. This design originated with the British gunmaker Holland & Holland for the purpose of headspacing certain of their more powerful cartridges. Especially the non-shouldered (non-"bottlenecked") magnum rifle cartridges 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 this over-insertion. An example of an American adaption of this practice is seen in cartridges like the .458 Winchester Magnum, also a shoulderless heavy magnum.</p><p></p><p>Many subsequent cartridges of "magnum" nomenclature were based on the original .375 H&H cartridge, so over time the belt became something of a standardized attribute, expected as part of a 'magnum' cartridge. Many cartridge designs of the last century include this belt, but do not really require it.</p><p></p><p>In the last decade or so, there has been a trend toward beltless (rimless) magnums, virtually all of which are heavily shouldered designs that obviate the original motivation for a belt.</p><p></p><p>300 WSM (W-W): 79.0 grains</p><p>.300 Winchester Mag. (W-W): 90.4 grains</p><p></p><p>SAAMI specs: 64,000 PSI for the .300WinMag and 65,000 for the WSM. JohnnyK.</p></blockquote><p></p>
[QUOTE="johnnyk, post: 399245, member: 307"] The term belted magnum refers to any caliber cartridge, generally rifles, using a shell casing with a pronounced "belt" around its base that continues 2-4mm past the extractor groove. This design originated with the British gunmaker Holland & Holland for the purpose of headspacing certain of their more powerful cartridges. Especially the non-shouldered (non-"bottlenecked") magnum rifle cartridges 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 this over-insertion. An example of an American adaption of this practice is seen in cartridges like the .458 Winchester Magnum, also a shoulderless heavy magnum. Many subsequent cartridges of "magnum" nomenclature were based on the original .375 H&H cartridge, so over time the belt became something of a standardized attribute, expected as part of a 'magnum' cartridge. Many cartridge designs of the last century include this belt, but do not really require it. In the last decade or so, there has been a trend toward beltless (rimless) magnums, virtually all of which are heavily shouldered designs that obviate the original motivation for a belt. 300 WSM (W-W): 79.0 grains .300 Winchester Mag. (W-W): 90.4 grains SAAMI specs: 64,000 PSI for the .300WinMag and 65,000 for the WSM. JohnnyK. [/QUOTE]
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