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Rifles, Reloading, Optics, Equipment
Reloading
Brass Case Head Separation after 6 firings
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<blockquote data-quote="MagnumManiac" data-source="post: 2529681" data-attributes="member: 10755"><p>I have formed about a dozen different cases over the years. Most have been Ackley cases and the rest have been similar based on the 416 Rigby case, for which I use hydro forming dies after annealing the parent case. </p><p>I honestly think it depends on 2 factors; the brand of the case and the annealing.</p><p>With my 375 Weatherby the step up from the H&H case was too large for a neck up and false shoulder, same goes for my 416 Rigby based cases…so, the best method I have found is COW. No stretching occurs, the shoulders are fully formed yet slightly round and headspace is set correctly.</p><p>Have tried jammed, caused head separations on the third firing with 22-250AI, also tried mid range loads jammed, same results.</p><p>Have used false shoulders and COW, that worked out fine, it also works forming belted cases to headspace off the shoulder and I haven't had a separation yet.</p><p>I run several Win Model 70's, if you're checking you shoulder bump with the firing pin installed in the bolt STOP! Remove it and check your bump, otherwise you'll get false readings, the firing pin spring will alter where the bolt face is in regard to your measurement if using a comparator system.</p><p></p><p>Cheers.</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 2529681, member: 10755"] I have formed about a dozen different cases over the years. Most have been Ackley cases and the rest have been similar based on the 416 Rigby case, for which I use hydro forming dies after annealing the parent case. I honestly think it depends on 2 factors; the brand of the case and the annealing. With my 375 Weatherby the step up from the H&H case was too large for a neck up and false shoulder, same goes for my 416 Rigby based cases…so, the best method I have found is COW. No stretching occurs, the shoulders are fully formed yet slightly round and headspace is set correctly. Have tried jammed, caused head separations on the third firing with 22-250AI, also tried mid range loads jammed, same results. Have used false shoulders and COW, that worked out fine, it also works forming belted cases to headspace off the shoulder and I haven’t had a separation yet. I run several Win Model 70’s, if you’re checking you shoulder bump with the firing pin installed in the bolt STOP! Remove it and check your bump, otherwise you’ll get false readings, the firing pin spring will alter where the bolt face is in regard to your measurement if using a comparator system. Cheers. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Brass Case Head Separation after 6 firings
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