Now there's the question of *why* a simple chamber scrub did it. Was there some piece of metal in there deforming the bullets? Something else? I realize we may never know…still…seems off that a simple chamber scrub/polish had that much effect.Yep, was frustrated blowing ammo no change. Would have been nice to know but this $125 barrel was about to get the scrap can. Now it seems okay. I feel the chamber scrub was big. Hitting the crown with a tool (a little bit) didnt do much of anything.