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Old August 6, 2013, 10:23 PM   #20
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Join Date: July 5, 2007
Location: Pacific NW
Posts: 1,310
Originally Posted by oldNewbie
How critical is primer seating depth in a semi-auto?
I have reloaded a few thousand rounds of .45 ACP. I have never cleaned primer pockets.

That doesn't mean it is unnecessary, just that I have been lucky enough to have never encountered the problem.

I use CCI primers. Do other brands create more residue? I don't know.

Primers must be seated flush or slightly below so they don't interfere with the action going into battery, or cause an out-of-battery firing.

I generally check for this when I run every round through a chamber gauge, by just passing my finger over the primer.

Calipers would provide a more accurate check, but I've learned to check for flush "by feel". I'm not sure the added accuracy of a caliper check is necessary for this step.
.30-06 Springfield: 100 yrs + and still going strong
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