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Rifles, Reloading, Optics, Equipment
Reloading
Brass Separation Above Belt
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<blockquote data-quote="Barrelnut" data-source="post: 1380515" data-attributes="member: 74902"><p>I agree that it's a possible headspace issue. One FL resize that sets the shoulder back to standard dimensions after one firing of new brass, should not cause a head separation situation. I've loaded a lot of 7RM before and set the shoulder all the way back and not had one start to separate on the second firing.</p><p></p><p>I suggest using Hornady Comparator gauge set and measure the length of a new unfired case at the shoulder datum. Then measure it after firing the case. I think if it is more than .008 or so, that could be a problem. And may be why it is starting to seperate on the second firing. You need the comparator to tell you what is going on.</p><p></p><p>It is typical for belted magnum cases to stretch quite a bit on first firing, This is by design. They may not even reach full chamber dimensions on the first firing, It may take three firings and just neck sizing before it get hard to chamber before it is time to bump them back .002. that's the way I do with my 7RM.</p></blockquote><p></p>
[QUOTE="Barrelnut, post: 1380515, member: 74902"] I agree that it's a possible headspace issue. One FL resize that sets the shoulder back to standard dimensions after one firing of new brass, should not cause a head separation situation. I've loaded a lot of 7RM before and set the shoulder all the way back and not had one start to separate on the second firing. I suggest using Hornady Comparator gauge set and measure the length of a new unfired case at the shoulder datum. Then measure it after firing the case. I think if it is more than .008 or so, that could be a problem. And may be why it is starting to seperate on the second firing. You need the comparator to tell you what is going on. It is typical for belted magnum cases to stretch quite a bit on first firing, This is by design. They may not even reach full chamber dimensions on the first firing, It may take three firings and just neck sizing before it get hard to chamber before it is time to bump them back .002. that's the way I do with my 7RM. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Brass Separation Above Belt
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