Recently had a gentleman ask about methodology for a primer seating depth test with our Competition Primer Seater. I'll likely have an article on it in the future in the Primal Rights library section, but for now, I thought I'd post the quick and ugly version, in the event others are having the same questions. By the way, our CPS is back in stock and we've got some amazing new primer tubes that ship with the unit which are compatible with the Double Alpha PrimaFill! They are even color matched, so black tube for black shuttle, red tube for red shuttle!
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Measure the primer pocket depths.
Measure the overall primer thickness.
Measure the anvil protrusion.
So if your primer pocket depth is .130, and your primer thickness is .125, you'd need to be 5 thousandths below flush to have anvil contact. If your anvil protrudes 10 thousandths from the top of the cup, then you know you can go to 15 thousandths below flush before you have full crush and the cup contacts the bottom of the pocket. So there's your window.
So you start at anvil contact, shoot your test shots, then click the CPS one click (one thousandth) deeper. You'll often measure a linear movement in the primer that will equal your adjustment, but if you don't... don't sweat it because the primers tend to take a set and deform. So even though you have 10 thousandths or whatever of room, it might take more clicks than that to get it to the final adjustment. The key is, to test at each adjustment of the CPS, regardless whether it provides a measurable change in primer seating depth. So you fire your test rounds at each click of the CPS, until full crush or maybe a couple clicks past it.
Make sure to fire an appreciable number of rounds at each setting. Obviously the rest of your reloading, rifle, optic, and skills ecosystem must be fully tuned if you're to see a substantiated benefit here.
If you have any questions, feel free to call.
Thank you,
Greg Dykstra
Primal Rights, Inc
605-554-1911
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Measure the primer pocket depths.
Measure the overall primer thickness.
Measure the anvil protrusion.
So if your primer pocket depth is .130, and your primer thickness is .125, you'd need to be 5 thousandths below flush to have anvil contact. If your anvil protrudes 10 thousandths from the top of the cup, then you know you can go to 15 thousandths below flush before you have full crush and the cup contacts the bottom of the pocket. So there's your window.
So you start at anvil contact, shoot your test shots, then click the CPS one click (one thousandth) deeper. You'll often measure a linear movement in the primer that will equal your adjustment, but if you don't... don't sweat it because the primers tend to take a set and deform. So even though you have 10 thousandths or whatever of room, it might take more clicks than that to get it to the final adjustment. The key is, to test at each adjustment of the CPS, regardless whether it provides a measurable change in primer seating depth. So you fire your test rounds at each click of the CPS, until full crush or maybe a couple clicks past it.
Make sure to fire an appreciable number of rounds at each setting. Obviously the rest of your reloading, rifle, optic, and skills ecosystem must be fully tuned if you're to see a substantiated benefit here.
If you have any questions, feel free to call.
Thank you,
Greg Dykstra
Primal Rights, Inc
605-554-1911
