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Rifles, Reloading, Optics, Equipment
Gunsmithing
Rifle cartridge "headspace" on case mouth
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<blockquote data-quote="J E Custom" data-source="post: 1086959" data-attributes="member: 2736"><p>A rimless cartridge is very possible and there are quite a few people doing this.</p><p></p><p>There are however some problems with then especially one that long. Most of the successful rimless cartridges are for pistols and considered short compared to what you want to build.</p><p></p><p>Head space is very critical and the longer the case the more care that has to be taken to trim often.</p><p>(The longer a case the more it grows when fired and that growth changes the head space.</p><p></p><p>If the powder charge is low this problem will be minimized, but the higher pressure loads will have to be trimmed often, if not every time to maintain headspace. High pressure pistol cartridges normally have rims to head space and sometimes they have to be trimmed to chamber easy after several firings.</p><p></p><p>I would recommend something like the 50/140 caliber brass because it can be trimmed to whatever length you want and it has a rim for head spacing (Plus you can buy dies for it).</p><p></p><p>Also the 458 Lott would do what you want if you trimmed the brass and it has a belt to headspace on</p><p>there are dies for it also. it is a 45 cal but with 500 grain bullets it could be awesome sub sonic or super sonic.</p><p></p><p>Just a heads up from someone that has built rifles like this and found them to be problematic.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1086959, member: 2736"] A rimless cartridge is very possible and there are quite a few people doing this. There are however some problems with then especially one that long. Most of the successful rimless cartridges are for pistols and considered short compared to what you want to build. Head space is very critical and the longer the case the more care that has to be taken to trim often. (The longer a case the more it grows when fired and that growth changes the head space. If the powder charge is low this problem will be minimized, but the higher pressure loads will have to be trimmed often, if not every time to maintain headspace. High pressure pistol cartridges normally have rims to head space and sometimes they have to be trimmed to chamber easy after several firings. I would recommend something like the 50/140 caliber brass because it can be trimmed to whatever length you want and it has a rim for head spacing (Plus you can buy dies for it). Also the 458 Lott would do what you want if you trimmed the brass and it has a belt to headspace on there are dies for it also. it is a 45 cal but with 500 grain bullets it could be awesome sub sonic or super sonic. Just a heads up from someone that has built rifles like this and found them to be problematic. J E CUSTOM [/QUOTE]
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Rifle cartridge "headspace" on case mouth
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