Comments on: New Hand Priming Tool Offers Adjustable Primer Seating Depth

By: David Lawson

David Lawson — Fri, 29 May 2015 10:59:20 +0000

As long as the primer is securely seated, whether it is .003 or .007 it does not affect accuracy one iota.

By: John Cowles

John Cowles — Fri, 31 Jan 2014 04:38:45 +0000

May I take exception with your comment. I think that after you reform and clean the primer pocket, you shouldn’t have a problem with crushed primers. Yes, each company has different size primers, but if you are using the same brand,you shouldn’t have any problem.

By: mike

mike — Sat, 28 Aug 2010 00:17:27 +0000

Seating primers to the same depth might hurt more than help. In fact, it could very well be that seating by feel produces better results.

I use the K&M indicated seater & seat to exact primer crush(3-5thou depending on brand). This does not correlate to ‘depth’ because pockets are different in depth, and/or primers are different in height. He K&M zero’s out both at once, and shows you real quick that you cannot arrive here by feel.

To my point, seating all primers to the same depth would all but guarantee different crushes.
And although I have no rules of thumb, I have found that crush and firing pin settings affect SD, and load potential, per brand/type of primer.