The Official Uberti USA Rate of Twist Chart
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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.
