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Is that Derraco primer system? Is it any good? Was just looking at it, seems cheaper then the Hornadys one, however I am not sure of the priming speed and functionality of the Derracos. Any first hand recommendations?Right. And here I was going to send him one of these to test, but he clearly has it all worked out—I mean, if you can shoot 0s using the firing pin to seat primers, God bless him. He clearly doesn't need any addition refinements.
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What's wrong with 71?
So if there's .003 variation in the same box are you measuring each primer and adjusting seating depth for each primer? Otherwise isn't this an effort in futility?...and the variance between the primers in each respective box is just as prevalent.
So one seats that 0.118" CCI three thou below flush in a 0.121" pocket and think they are at touch...until the next one is 0.115" from the same box and the firing pin is shoving shit forward (thereby decelerating and dicking up the timing)...sometimes.
"Sometimes" and "Might" are not things I would want in my ammo boxes.
No, sir, I set the anvil so deep that any variance is moot...."fully" crushed.
I think they work well...super easy conversion from large to small primers...micrometer with 0.01mm detents...accepts Dillon tubes (maybe others, unsure...just use Dillion's)...and will go just as fast as you can on a single stage.
Is there an echo in here?
I've measured cup height in the past, as I was very curious about their consistency, and found them to be very consistent. When I measure a primer's over all height, which includes the distance the anvil protrudes above the cup, I do often find variance often being ~.003". And because of that I'll take the shortest measurement and set my seating (which varies from one brand or lot of brass to another) to get ~.003" "crush", which means the taller ones will be "crushed" an additional .003" into my uniformed primer pockets. Regardless of the amount of "crush", the seating below flush is uniform for what I feel give consistent firing pin strikes for consistent ignition. Because the the difference between the cup height and the over all height might be something like .009" before the cup is actually seated against the bottom of the pocket, there's plenty of room to get close enough to the bottom of the pocket and have decent "crush" and consistent seating depth below flush from the base of the case. I've had a small variation in "crush" (like .003") that hasn't produced any measurable difference in velocities or results on paper.
BTW - I own the Derraco PCPS.
I think the 'non-liner' micrometer adjustment is the nature of the beast when dealing with a myriad of variables, but would yield to engineers who suggest otherwise.
Even with the Mitutoyo micrometer head on the SAC seating die, I find there is a sweet-spot where 1 click = 0.001" in seating depth; however, there's also a window when I want to seat a bullet, say, 4 thou deeper and 4 clicks yields a negligible impact.
I can't explain it, but I can measure it.
I've measured cup height in the past, as I was very curious about their consistency, and found them to be very consistent. When I measure a primer's over all height, which includes the distance the anvil protrudes above the cup, I do often find variance often being ~.003". And because of that I'll take the shortest measurement and set my seating (which varies from one brand or lot of brass to another) to get ~.003" "crush", which means the taller ones will be "crushed" an additional .003" into my uniformed primer pockets. Regardless of the amount of "crush", the seating below flush is uniform for what I feel give consistent firing pin strikes for consistent ignition. Because the the difference between the cup height and the over all height might be something like .009" before the cup is actually seated against the bottom of the pocket, there's plenty of room to get close enough to the bottom of the pocket and have decent "crush" and consistent seating depth below flush from the base of the case. I've had a small variation in "crush" (like .003") that hasn't produced any measurable difference in velocities or results on paper.
Primers seated to far from the base of primer pockets can be a big problem (like, fail to fire) and primers overly crushed produce very inconsistent ignition. Don't ask me how I know.
As an old friend once replied to his psychologist when asked what he thought an obsession was:
