I have had a set of 357 Herrett barrels for some time. I have not spent alot of time working on this problem. The brass that came with barrels have a 50% misfire rate. I may have not properly resized the cases and moved the shoulders back.
So I am going to start over. I have some 30-30 cases to try and make a good set of cases. It there a way to blow out the cases without wasting more powder, bullet and time.
I should add this, this problem is with two barrels using an original frame and a G2 with same results.
My 30 Herrett works like a dream on the same frames.