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Rifles, Reloading, Optics, Equipment
Reloading
First case head separation
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<blockquote data-quote="Carey Farmer" data-source="post: 2909849" data-attributes="member: 122715"><p>Exactly. And belted cases typically stretch a LOT on the first firing. I can't help but think that sets up belted cases for case-head separation.</p><p></p><p>Almost every belted mag case I've bought has been around 0.015" short of a SAAMI chamber. So I had my belted mag reamer made up with headspace 0.010" short of SAAMI. Haven't found a brand of factory ammo that is too long to chamber. Only issue is I had to lap 0.004" off the bottom of my full length sizing die to be able to bump the shoulders of a fired case.</p><p></p><p>Whenever I full length size, the squeeze of the case body causes the case to lengthen by about 0.002". If I don't bump the shoulders at all after the first firing, the cases chamber a little snug in my short-headspace chamber. So I bump the shoulders back to the same headspace they came out of the chamber. I continue to do this on subsequent firings. Haven't seen a need to bump the shoulders shorter than they came out of the chamber.</p><p></p><p>I anneal after every firing. I aim my flame at the shoulder, not at the neck-shoulder junction, so I get a good anneal of the shoulders and upper case wall. When I anneal this way, it takes WAY less force on the press handle to bump the shoulders, so I'm pretty sure that I'm helping ensure that stretching in the chamber happens at the shoulder, not at the web.</p><p></p><p>With all of the above my belted cases have no problems with case head separation.</p></blockquote><p></p>
[QUOTE="Carey Farmer, post: 2909849, member: 122715"] Exactly. And belted cases typically stretch a LOT on the first firing. I can't help but think that sets up belted cases for case-head separation. Almost every belted mag case I've bought has been around 0.015" short of a SAAMI chamber. So I had my belted mag reamer made up with headspace 0.010" short of SAAMI. Haven't found a brand of factory ammo that is too long to chamber. Only issue is I had to lap 0.004" off the bottom of my full length sizing die to be able to bump the shoulders of a fired case. Whenever I full length size, the squeeze of the case body causes the case to lengthen by about 0.002". If I don't bump the shoulders at all after the first firing, the cases chamber a little snug in my short-headspace chamber. So I bump the shoulders back to the same headspace they came out of the chamber. I continue to do this on subsequent firings. Haven't seen a need to bump the shoulders shorter than they came out of the chamber. I anneal after every firing. I aim my flame at the shoulder, not at the neck-shoulder junction, so I get a good anneal of the shoulders and upper case wall. When I anneal this way, it takes WAY less force on the press handle to bump the shoulders, so I'm pretty sure that I'm helping ensure that stretching in the chamber happens at the shoulder, not at the web. With all of the above my belted cases have no problems with case head separation. [/QUOTE]
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First case head separation
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