Did some shooting this morning with 3 different primer brand. Once again the shooting began with the same cold clean 45 caliber Omega rifle, and breech plug. The same bullet, sabot, and powder was used as in the original post. The breech plug' flash hole has now grown to 0.033". The flame channel is still 5/32". Before the breech plug was installed into the rifle, it was shortened 0.020", which reduces the head space, and necessitates the use of an o-ring. There was zero blow by around the nose of all three primer brands, because of the seal provided by the o-ring. However the STS leaked. Neither the Federal, or the Winchester leaked.


After the 10 shots, the breech plug was removed in the field, yes a tool was needed, and replaced by a brand new factory breech plug. No o-ring was used in this shiny new breech plug. Using the same load, three shots were taken with each primer brand.









Once again, the STS primers leaked. Neither the Federal 209A, nor the Winchester W209 primers leaked. There was some blow by around the nose of the 209A primer, but none around the W209.