5.2 grains of Trail boss, or Unique. I even tried loading up primers in cases and firing them with no powder/bullets. They still pop out??
As stated, 5.2 grains of unique is a very light load. With this light of a load, the primers will always back out, then fail to be re-seated by the pressure build up in the chamber. The same thing happens when firing a primed, empty case.
I have new magtech brass, and with factory remington loads I have no problems at all. Maybe this is a simple issue of old cases. Let me clarify: The primers pop out on other rounds in the cylinder, not only the one being fired.
In other words, you fully load the cylinder with six rounds, then fire one round, the others unfired rounds have their primers back out? If that's the result, then toss that "mixed brass" out, get some new brass, your primer pockets are too loose.
Thanks for the interest and advise.
I am using 7.9 grains of Unique, and 250 grn Laser cast lead, or Hornady XTP's.
That's a better load of unique, but still under what the Lyman 48th manual recommends as a starting load for their 255 lead SWC. Their starting load is 8.5 grains of unique.
Hodgdon's data for 45 long colt, with trail boss, 250 lead RNFP, starts at 5.4, for 606 fps and 8,800 psi, and tops out at 5.8, for 727 fps and 12,700 psi. Again low pressures that will result in primers backing out and failing to be reseated by chamber pressure.