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Rifles, Reloading, Optics, Equipment
Reloading
"Rebounding" NATO 7.62 brass???
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<blockquote data-quote="VinceMule" data-source="post: 2728733" data-attributes="member: 122164"><p>OP, the answer lies in some understanding of metallurgy. </p><p></p><p>The Military brass was likely fired in a machine gun with a large chamber. The brass swelled out upon firing.</p><p></p><p>Now, you some years later sized the brass down to a smaller size. Over time, the brass starts to "normalize" or "spring back" swelling back out, trying to reach that first chamber dimension.</p><p></p><p>We size with a Small base sizer to allow for this kind of "normalizing or spring back". </p><p></p><p>Success comes in keeping the ammo "fresh" with that kind of brass.</p><p></p><p>Annealing prior to sizing helps in the neck and to some degree the shoulder, but not the web area.</p><p></p><p>Also, after decapping the brass, I check for off-center flash holes. I have had lots of LC that were terrible in this regard. I hold up a hand full at a time, examining under bright light.</p><p></p><p>I always sort by year on LC brass as it does vary considerably, and if you are looking for 1/2" groups or less, this is a critical issue.</p></blockquote><p></p>
[QUOTE="VinceMule, post: 2728733, member: 122164"] OP, the answer lies in some understanding of metallurgy. The Military brass was likely fired in a machine gun with a large chamber. The brass swelled out upon firing. Now, you some years later sized the brass down to a smaller size. Over time, the brass starts to "normalize" or "spring back" swelling back out, trying to reach that first chamber dimension. We size with a Small base sizer to allow for this kind of "normalizing or spring back". Success comes in keeping the ammo "fresh" with that kind of brass. Annealing prior to sizing helps in the neck and to some degree the shoulder, but not the web area. Also, after decapping the brass, I check for off-center flash holes. I have had lots of LC that were terrible in this regard. I hold up a hand full at a time, examining under bright light. I always sort by year on LC brass as it does vary considerably, and if you are looking for 1/2" groups or less, this is a critical issue. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
"Rebounding" NATO 7.62 brass???
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