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Rifles, Reloading, Optics, Equipment
Reloading
6.5x284 Norma
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<blockquote data-quote="dok7mm" data-source="post: 2576867" data-attributes="member: 90080"><p>[USER=106967]@338 dude[/USER] has made a positive point on the effect of early case head separation when using annealing prior to resizing.</p><p></p><p>Another cause is bumping .002" (or more) after first firing of brass. It often doesn't fully expand to true headspace until after 2nd firing. If you set up your resizing die for .002 bump after one firing, you can actually be bumping a lot more than you realize, which causes the early separation.</p><p></p><p>After first firing, I always set up my resizing die a bit high, so that there is sizing of case, but no bump. I'll size 5 cases like this, wipe them clean and measure base to datum, mark those cases and chamber them with my stripped bolt (firing pin & ejector removed). If they chamber, I know not to bump shoulders until after 2nd firing.</p><p></p><p>I will then resize all my once fired brass and run them thru my chamber. Any that won't chamber, I set aside until 2nd resize. It can be a pita, but beats early case separation.</p></blockquote><p></p>
[QUOTE="dok7mm, post: 2576867, member: 90080"] [USER=106967]@338 dude[/USER] has made a positive point on the effect of early case head separation when using annealing prior to resizing. Another cause is bumping .002" (or more) after first firing of brass. It often doesn't fully expand to true headspace until after 2nd firing. If you set up your resizing die for .002 bump after one firing, you can actually be bumping a lot more than you realize, which causes the early separation. After first firing, I always set up my resizing die a bit high, so that there is sizing of case, but no bump. I'll size 5 cases like this, wipe them clean and measure base to datum, mark those cases and chamber them with my stripped bolt (firing pin & ejector removed). If they chamber, I know not to bump shoulders until after 2nd firing. I will then resize all my once fired brass and run them thru my chamber. Any that won't chamber, I set aside until 2nd resize. It can be a pita, but beats early case separation. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
6.5x284 Norma
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