How to tell the difference

[old breed]

My experience was that CCI Blazer brass went to small primers first, so, depending on what's happened since, you might be able to sort by brand with reasonable accuracy.

blazer small pistol as said before, by mobuck just use a large pocket cleaner until your eyes adapt, not long. as far as military crimp i started with an inside champher reamer years ago.moved to RCBS finally dillon. some primers seem to seat harder, difference in diameter? military brass is a pain to prime because it only takes one slightly high primer and you don't go into battery.rub your finger over primer to see after loaded.

 

[old breed]

sorry, if your single stage ,check after priming.

 

[s4s4u]

OK. I pulled 75 out and they are apparently are the same size so, given your superior eyesight what do I have.

Do you have the ability to measure a circular object with some degree of accuracy?

Large rifle are the same diameter as large pistol, for reference, and vice versa

 

[GasGuzzler]

I look at the pocket and if it's big, it's for a large pistol primer. If it's not big, it's for a small pistol primer.