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Reloading
Seating Depth
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<blockquote data-quote="Mikecr" data-source="post: 2707582" data-attributes="member: 1521"><p>You don't. There are a lot of things affecting striking and zero standards for it.</p><p>We have failed to define optimum striking for primers in general, much less different primers.</p><p>This would be a term similar to N/Sec^2/Std-area, and we would need a method of measure, and an easy way to calibrate it.</p><p>Primer space and crush would also be in the standard.</p><p></p><p>So what we're left with is an unaddressed abstract (a mess).</p><p>If you change to a titanium firing pin, let a spring weaken, or change a trigger, you have no idea what that will do to your grouping.</p><p>You might have to change primers, or go back to load development.</p><p>Or, you could re-optimize your striking.</p><p></p><p>Once I was forced to address an intermittent striking issue with an otherwise consistent 3/8moa at 500 hunting gun.</p><p>All primers fired, but here & there I would get an errant shot fully 3/4moa off my mark.</p><p>This screwed me over bad, as it was not an easy problem to figure out.</p><p>It turned out that the firing pin was slipping under it's set-screw.</p><p>Worse, there were no markings on the pin to see where it was originally set.</p><p>So I had to fire a group, adjust the pin, fire another group, repeat around 10 times, and then validate.</p><p></p><p>What I found was pretty much just like full seating testing. Grouping opened, closed, reopened.</p><p>And like seating, there was magic in this. It turned out that optimum striking gained me 1/8moa over my prior best.</p><p>In my lifetime, I would never have seen that hidden 1/8moa, without this problem & solution (curse to blessing).</p><p>I ended up making and installing a bushing in the bolt, so that this pin setting could never change again.</p><p></p><p>My next custom action, or maybe even one I already hold, will have adjustable pin setting from the back of the bolt shroud.</p><p>With that I'll test every different primer to see if optimum changes. I'm confident it will given the abstract primer choices people have ended up with. Validation is tricky in that I will need to powder develop at optimum, and off optimum, to isolate the real affect here.</p><p>If I'm really on to potential, then I could solve striking force/speed/area measurement to define what's what.</p><p>Or, die of old age before getting there... There is that...</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2707582, member: 1521"] You don't. There are a lot of things affecting striking and zero standards for it. We have failed to define optimum striking for primers in general, much less different primers. This would be a term similar to N/Sec^2/Std-area, and we would need a method of measure, and an easy way to calibrate it. Primer space and crush would also be in the standard. So what we're left with is an unaddressed abstract (a mess). If you change to a titanium firing pin, let a spring weaken, or change a trigger, you have no idea what that will do to your grouping. You might have to change primers, or go back to load development. Or, you could re-optimize your striking. Once I was forced to address an intermittent striking issue with an otherwise consistent 3/8moa at 500 hunting gun. All primers fired, but here & there I would get an errant shot fully 3/4moa off my mark. This screwed me over bad, as it was not an easy problem to figure out. It turned out that the firing pin was slipping under it's set-screw. Worse, there were no markings on the pin to see where it was originally set. So I had to fire a group, adjust the pin, fire another group, repeat around 10 times, and then validate. What I found was pretty much just like full seating testing. Grouping opened, closed, reopened. And like seating, there was magic in this. It turned out that optimum striking gained me 1/8moa over my prior best. In my lifetime, I would never have seen that hidden 1/8moa, without this problem & solution (curse to blessing). I ended up making and installing a bushing in the bolt, so that this pin setting could never change again. My next custom action, or maybe even one I already hold, will have adjustable pin setting from the back of the bolt shroud. With that I'll test every different primer to see if optimum changes. I'm confident it will given the abstract primer choices people have ended up with. Validation is tricky in that I will need to powder develop at optimum, and off optimum, to isolate the real affect here. If I'm really on to potential, then I could solve striking force/speed/area measurement to define what's what. Or, die of old age before getting there... There is that... [/QUOTE]
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