|
Your handloads are too low-powered to properly cycle the pistol.
Proof is the excessive powder marks on the cases. Your loads are obturating enough to even seal the case mouth to the chamber walls.
What are the specifics of your load?
I load Berry's 230-grain plated lead round nose bullets in .45 Auto using Winchester primers are 5.4 grains of Winchester 231. There are no published data for the Berry's bullets but, for other 230-grain FMJ bullets, 5.4 grains is over the max. However, with the Berry's bullets my velocities are well below what the books suggest I should be getting, and I was getting a lot of unburned powder and blow-by such as you describe.
|