460 sw bore diameter

[cakuipes]

Does anyone know why saami specs the bore for a 460S&W @ .444 when it's 45 cal pistol .451-.452.The pilot on the chamber reamer specs to the bigger diameter also.

 

[CCM]

.451 is the groove diameter. Bore is the the diameter across the lands.

The reamer you're referencing is probably for cylinders and not barrels.

 

[cakuipes]

Yes, I know, but bore diameter on 45 cal pistol is.442 not .444. The chamber reamer is for rifle. But 45 Raptor is .442 bore?

 

[CCM]

Ah, I misinterpreted what you were asking.

It might just be a classic case of "my design is better than yours." It doesn't really make any sense.

 

[243winxb]

Does anyone know why saami specs the bore for a 460S&W @ .444

The S&W Model 460XVR revolver features a specialized gain-twist (or progressive) rifling barrel, designed for extreme accuracy and high-velocity performance. This rifling starts with a slow twist rate and becomes faster towards the muzzle, which reduces initial pressure and stress on the bullet jacket while improving stabilization for long-range, high-energy shots.

The .444" land, does not cut as deep into the copper jacket. Keeps the bullet from failing.

Working pressure is 65,000 PSI