WIL TERRY said:
SHOOT the pistol first as you may be in for a most welcome surprise, Sir !!
And so it goes...
As in that's going to magically make the cylinder throats from .451" to .452" somehow?
If you took your car to a mechanic because it was running poorly and the mechanic said to simply drive the car, it might get better, would you take the car back to him again?
It's a known fact that a .452" bullet cannot pass through a .451" throat and emerge at .452" in diameter. It's a known fact that uneven cylinder throats produce variations in pressure that cause the gun to shoot to different points of impact because these variations cause the gun to recoil differently in the shooter's hands from shot to shot.
The most welcome surprise comes when the cylinder throats are all "dimensionally corrected" to deliver the .452" bullet to the barrel at .452" diameter, causing groups shrink noticeably and the barrel to magically quit leading.