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The Range
Ammo & Reloading
Case necks splitting
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<blockquote data-quote="MoBoost" data-source="post: 1633779" data-attributes="member: 3455"><p>The design had to be rimless for better mag feed and belted for push-type extraction - it is nothing more than rim moved a tad forward.</p><p></p><p>What about rimmed cartridges spaced off the rim you say?</p><p></p><p>Lets take .303 British. Rimmed cartridge with extreme body taper and basically no shoulder.</p><p>With black powder it was indeed headspaced on the rim, and low pressure just wouldn't stretch the brass. Once they went with smokeless, speed and pressures went up - you can still fire once headspaced off the rim, but SMLE chambers are cut very generously. If you were to full length size it and fire again you'd have head separation; so reloading has to be done off the shoulder.</p><p></p><p>And you know, 375 H&H was low pressure cartridge and can be fired at least once spaced off the belt, but with modern high pressure magnums case head separation is imminent.</p></blockquote><p></p>
[QUOTE="MoBoost, post: 1633779, member: 3455"] The design had to be rimless for better mag feed and belted for push-type extraction - it is nothing more than rim moved a tad forward. What about rimmed cartridges spaced off the rim you say? Lets take .303 British. Rimmed cartridge with extreme body taper and basically no shoulder. With black powder it was indeed headspaced on the rim, and low pressure just wouldn't stretch the brass. Once they went with smokeless, speed and pressures went up - you can still fire once headspaced off the rim, but SMLE chambers are cut very generously. If you were to full length size it and fire again you'd have head separation; so reloading has to be done off the shoulder. And you know, 375 H&H was low pressure cartridge and can be fired at least once spaced off the belt, but with modern high pressure magnums case head separation is imminent. [/QUOTE]
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