The first place I look for accuracy problems with a handgun is in the mirror.
There’re tough to shoot, though optics help. Not sure if anything other than choice of primer/powder/bullet, and neck tension/crimp is going to make meaningful difference. Not even certain that velocity spreads, unless really wide, matter all that much. All sounds like good clean fun though
How about some details on your setup?
Gonna guess if he is this serious about loads and testing ammo and theories its a waste to ask if he can shoot well enough.....
