I was thinking hardness might be an issue. Max velocity for .45 is around 900 fps?
10 bhn might be a bit too much? Might be gas cutting? Or blow-by due to lack of .....ob-tur-blur-ation or however its spelled. Obteration?
But theres the coating so............................that should eliminate it?
Thinking while I type, bear with me.
Still measuring .452 on the pulled bullets?
So I'm looking in the Lymans book (cast 4th) and it calls for a 1.272" o.a.l. but you went ..........1.220 (scrolling, thinking AND typing, this could get dangerous) and running 4.6 of bullseye ( book shows 4.0/5.0).....so you're in the middle...........but......... would setting it back .040 cause that much of a difference in velocity?
List 4 gr= 680 fps/ 5 gr = 815 f.p.s. @ 1.272" with chamber pressure at 10,100/ 14,400.................I guess setting it back that .040" with that powder put you more towards the 800 fps/14,400 mark with a "hardcast"
Would a lesser bhn seal better on a low velocity round?
I'd still like to see what they look like out of the berm and if its still .452 on the pulled ones. And what that chamber looks like, although if you've shot and never had an issue with s.w.c.'s.........then.............aliens..........................