Originally Posted by JonM
with such heavy bullets they prolly arent stabilizing well with the light 380acp charges and twist of the barrel. so yeah its entirely possible for that to happen when using bullets outsidethe cartridge and gun's performance envelope.
I probably shouldn't have included the comment about the 9mm bullets with my question
Two totally different discussions.
The left and right impact zones were with std .380 bullets. One being commercial bullets, the other being the reloader with his std load using titegroup powder. Don't have the exact measure that he uses. One was shooting right, the other shooting left. Just seemed odd to me.
The second was just a comment on his trying 115(?) 9mm bullets in the .380. It was an experiment he wanted to try, and ran them in his guns first before reaching out to some of his other customers. He wanted to try them in a variety of firearms to see what impact they would have. It was an extension of his making 147 9mm ammo. In the 9mm, the heavier bullet for competitive shooting it is mucho more accurate. But my wife was not found of getting pelted in the head with brass from her .380, and I forgot to run the ammo through my LCP yesterday. Only had a handful of these rounds, and what few I have left I'll give him back.
Sorry for the confusion