The Official Uberti USA Rate of Twist Chart

Knowing the rate of twist of your Uberti USA revolver—or, even more importantly, rifle—is essential for getting the most out of it. In the case of a black powder revolver, you’ll be shooting round ball so it’s not as critical, but here’s when knowing your exact bore and groove diameter becomes key. In the case of a cartridge revolver or rifle, both measurements are vitally important.
Here’s a chart detailing the various rates of twist and bore + groove diameters, by caliber.
CALIBER | TWIST | DIRECTION | BORE | GROOVE | N. OF GROOVES | |
---|---|---|---|---|---|---|
Black Powder
| .31 .36 .44 | 1:32" 1:32" 1:18" | LH LH LH | 0.310" 0.360" 0.440" | 0.325" 0.379" 0.458" | 7 7 7 |
Rimfire
| .22LR .22 Mag | 1:16" 1:16" | RH RH | 0.217" 0.217" | 0.222" 0.224" | 6 6 |
Centerfire (Pistol & Rifle)
| .38 Special .357 Mag .44/40 .45 Colt | 1:18.75" 1:18.75" 1:20" 1:16" | RH RH RH RH | 0.346" 0.346" 0.4215" 0.442" | 0.355" 0.355" 0.429" 0.450" | 6 6 6 6 |
Centerfire (Rifle)
| .45/60 .45/70 .45/75 .45/90 .50/95 | 1:40" 1:20" 1:20" 1:20" 1:48" | RH RH RHR HR H | 0.400" 0.450" 0.450" 0.450" 0.500" | 0.406" 0.456" 0.456" 0.456" 0.507" | 6 6 6 6 6 |
Pedersoli* | 45/70 | 1:18" | RH | 0.450" | 0.457" | 6 |
* All Uberti USA-branded Sharps and Trapdoor rifles are manufactured by Pedersoli.