Here's what a .40cal. 410gr. 16:1 (lead:tin) alloy bullets looks like when fired with only a Federal GM150M large pistol primer.  As you can see, it didn't quite make it fully into the bore.  I was surprised it was driven in that far.

Wayne

Use a primed case for a breech seater.

.22-5-40 wrote on Jul 2^nd, 2024 at 1:05pm:


Been doing just that around here for a few years now.  Much less distortion of the bullet base, and no risk of damaging the throat.  With practice I can stop the bullet anywhere in the barrel.

Winchester small rifle primers served well in my 222Rem
rifle- a Marlin-Sako model 322, with Microgroove barrel to propel pellets with reasonable accuracy across the basement into a pellet trap for offhand practice
beltfed/arnie

I recall reading Civil war marksmen shooting primer loads in friendly competition. I’ve tried it and the primer alone in the 45-70 will clear a bullet but without 
performance

Those interested in primer performance should look for the writings of Creighton Audette where he conducted volumes of testing on brisance, spread and flame characteristics of most all available primers. As I recall his testing methods and data overlapped some of the testing and findings from Homer Powley the famous Olin ballistician.  So for whatever it’s worth

Correction, Correction:  the Civil War primer only matches were candle matches. Primer only trying to blow out candles at a certain distance. 

Rick