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Rifles, Reloading, Optics, Equipment
Reloading
Brass still good to go ?
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<blockquote data-quote="abinok" data-source="post: 111827" data-attributes="member: 16"><p>Measureing of the extractor groove is meant to be an indicator of pressure... not of head seperation. As long as you don't have a lot of differance between your virgin brass and your chamber.... headspacewise.... and you are sizing with the lee die, you are going to split necks loooooooong before you have head seperation issues. if youve got .005" expansion of Lapua brass, your loads are hot. Id expect .001" on the first firing, but no more than .001" more (.002" total) for the life of the case. I usually load 3 cases to distruction during load development so I know that pressure issues don't manafest long term. That way I can put 5 shots on a piece of brass in 15 shots. if im seeing more than .002" total after the 3rd-5th loading, I know its time turn the volume down a bit.</p><p>Ill bet youre in the 68000-70000psi Range if youre seeing .005" expansion at 4 firings. Remember the 243AI Lapua brass you showed me with the ejector mark on the head? About the same pressure, but the magnum brass won't manafest ejector marks as soon because its thicker, and of a harder alloy/annealing.</p><p>If its still holding primers fine, id keep shooting it, but back down on the powder buddy.</p></blockquote><p></p>
[QUOTE="abinok, post: 111827, member: 16"] Measureing of the extractor groove is meant to be an indicator of pressure... not of head seperation. As long as you don't have a lot of differance between your virgin brass and your chamber.... headspacewise.... and you are sizing with the lee die, you are going to split necks loooooooong before you have head seperation issues. if youve got .005" expansion of Lapua brass, your loads are hot. Id expect .001" on the first firing, but no more than .001" more (.002" total) for the life of the case. I usually load 3 cases to distruction during load development so I know that pressure issues don't manafest long term. That way I can put 5 shots on a piece of brass in 15 shots. if im seeing more than .002" total after the 3rd-5th loading, I know its time turn the volume down a bit. Ill bet youre in the 68000-70000psi Range if youre seeing .005" expansion at 4 firings. Remember the 243AI Lapua brass you showed me with the ejector mark on the head? About the same pressure, but the magnum brass won't manafest ejector marks as soon because its thicker, and of a harder alloy/annealing. If its still holding primers fine, id keep shooting it, but back down on the powder buddy. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Brass still good to go ?
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