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  • The Official Uberti USA Rate of Twist Chart

The Official Uberti USA Rate of Twist Chart

The Official Uberti USA Rate of Twist Chart
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The Official Uberti USA Rate of Twist Chart

by Tom Leoni on May 04th, 2017

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.

 CALIBERTWISTDIRECTIONBOREGROOVEN. 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*45/701:18"RH0.450"0.457"6

* All Uberti USA-branded Sharps and Trapdoor rifles are manufactured by Pedersoli.

Tom Leoni
Tom was born in Switzerland and grew up in Northern Italy. His passion for collecting and shooting historical firearms began in the 1990’s, when he moved to the United States. By 2000, he was competing in high-power rifle matches, hunting big game in two continents and working as a product manager in the firearms industry. He currently works for Benelli USA as the Uberti USA product manager and is part of the Swiss Rifles of Washington DC shooting team. Tom’s other interests are classical and folk music, historical Western martial arts (published author) and historical reenactment.
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