S&W PC 952. Tight, accurate, great trigger, hated it.
I'd tend to believe that a significant burr on the muzzle crown of a firearm's barrel would be a more plausible explanation for such poor accuracy than ammo selection, unless of course a smaller diameter projectile than what was called for was mistakenly used during handloading?Another thought.
If you are getting 2” from 10 yards from a BENCH REST then maybe it’s the ammo and not the gun?
Wonder what the difference would be with factory loads?