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Long Range Hunting & Shooting
A question about bumping the shoulder?
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<blockquote data-quote="entoptics" data-source="post: 1716298" data-attributes="member: 104268"><p>Come on guys. It's just as complicated as the OP is willing to go.</p><p></p><p>For all practical purposes, "shoulder bump", is the difference between where your brass fire forms to the chamber's shoulder, and where your dies mash the brass back.</p><p></p><p></p><p>It absolutely IS headspace, at least as commonly defined in the reloading community.</p><p></p><p>"Proper Headspace", for all intents and purposes, is the distance a piece of brass can expand safely upon firing, without rupturing/weakening due to stretching and thinning.</p><p></p><p>A once fired piece of brass approximates the chamber dimensions (with OAL fixed at the bolt face). When you mash that piece of brass through a sizing die, it shrinks a certain amount. The difference is the "head space". The same can be said for factory ammo. If the factory ammo is shorter than the chamber by 0.010", then for all practical purposes, the headspace is 0.010".</p><p></p><p>Go, No-Go, and Field gauges are simply a way to conveniently test reference values for this distance for various cartridges. If it was some rule, defined by a datum, then there would be no such thing as wildcats. There'd be no threads on forums discussing how to go about setting a proper shoulder bump.</p><p></p><p>Each chamber is different by a few thousandths.</p><p></p><p>Comparators can't be much more accurate than that?</p><p></p><p><em>If you want to check all the boxes as a reloader, measure your rifle with tools you have, then do your best to make brass that fits that rifle.</em></p></blockquote><p></p>
[QUOTE="entoptics, post: 1716298, member: 104268"] Come on guys. It's just as complicated as the OP is willing to go. For all practical purposes, "shoulder bump", is the difference between where your brass fire forms to the chamber's shoulder, and where your dies mash the brass back. [SIZE=14px][/SIZE] It absolutely IS headspace, at least as commonly defined in the reloading community. "Proper Headspace", for all intents and purposes, is the distance a piece of brass can expand safely upon firing, without rupturing/weakening due to stretching and thinning. A once fired piece of brass approximates the chamber dimensions (with OAL fixed at the bolt face). When you mash that piece of brass through a sizing die, it shrinks a certain amount. The difference is the "head space". The same can be said for factory ammo. If the factory ammo is shorter than the chamber by 0.010", then for all practical purposes, the headspace is 0.010". Go, No-Go, and Field gauges are simply a way to conveniently test reference values for this distance for various cartridges. If it was some rule, defined by a datum, then there would be no such thing as wildcats. There'd be no threads on forums discussing how to go about setting a proper shoulder bump. Each chamber is different by a few thousandths. Comparators can't be much more accurate than that? [I]If you want to check all the boxes as a reloader, measure your rifle with tools you have, then do your best to make brass that fits that rifle.[/I] [/QUOTE]
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A question about bumping the shoulder?
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