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Rifles, Reloading, Optics, Equipment
Reloading
Ideal primer pocket depth?
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<blockquote data-quote="MagnumManiac" data-source="post: 2577603" data-attributes="member: 10755"><p>The concave bottom that the factory punches is the BEST shape the primer pocket can be….a flat bottom impedes gas flow….but you can do as you like.</p><p>If talking how far a primer needs to be seated…..well there is no such thing.</p><p>It is the amount of crush AFTER the cup and anvil are flush with each other that matters the most. This "cushion" and " pre-tension" affect the primer ignition the most and is what makes a primer ignition across the entire batch the most consistent.</p><p>If this is .004" crush, then that's what it takes to get that brand primer to ignite the same each time. Seating depth must be measured first, then crush and then experimentation with crush after that. A 10 round group of each crush amount will then determine the best crush.</p><p></p><p>Cheers.</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 2577603, member: 10755"] The concave bottom that the factory punches is the BEST shape the primer pocket can be….a flat bottom impedes gas flow….but you can do as you like. If talking how far a primer needs to be seated…..well there is no such thing. It is the amount of crush AFTER the cup and anvil are flush with each other that matters the most. This “cushion” and “ pre-tension” affect the primer ignition the most and is what makes a primer ignition across the entire batch the most consistent. If this is .004” crush, then that’s what it takes to get that brand primer to ignite the same each time. Seating depth must be measured first, then crush and then experimentation with crush after that. A 10 round group of each crush amount will then determine the best crush. Cheers. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Ideal primer pocket depth?
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