Thread: Revolver Conversion to 9mm
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Old 09-09-2016, 01:34 PM
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Originally Posted by Kernel Crittenden View Post
What's factory 9mm (0.355") accuracy like from a S&W 0.357" barrel?
Absolutly fine

Remember that .355" and .357" are the GROOVE diameter, not the LAND diameter. The land diameter on a .357" barrel is typically .346". That provides .011" of rifling to engage the projectile. So if you use a .355" projectiles you only have .009" of rifling in play.

.009" of rifling engagement is more than sufficient to get a projectile spinning.

It is the spin that barrels put on a projectile that causes them to be accurate.
Last edited by colt_saa; 09-09-2016 at 01:37 PM.
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