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Calibers and Twist Rates

Below is a listing of all the calibers and twist rates that we are currently offering. Some twists are available in more than one groove configuration as indicated.

Caliber
Twist Rate in Inches & Number of Grooves
.172 (.17) 6" 4-G, 7" 4-G, 9" 4-G, 10" 4-G
.177 (airgun) 17" 4-G
4.6 mm 6" 4-G
.204 (.20, 5mm) 9" 3-G, 12" 3-G
.22 RF 9" 3-G, 15" 6-G, 16" 3-G 4-G 6-G, 17" 4-G
.224 (.22) 7" 3-G 6-G, 8" 3-G 4-G 6-G, 9" 6-G, 10" 6-G, 12" 3-G 6-G, 14" 3-G 6-G, 15" 3-G 6-G
.226 (.22 HP) 14" 6-G
.234 10" 6-G
.243 (6mm) 7" 3-G, 8" 3-G, 9" 3-G 6-G, 10" 3-G 6-G, 12" 3-G 6-G, 13" 3-G 6-G, 14" 3-G 6-G, 15" 3-G 6-G, 16" 6-G
.257 (.25) 7" 3-G, 8" 3-G, 10" 3-G 6-G, 12" 6-G, 13" 6-G, 14" 6-G
.264 (6.5mm) 8" 3-G 6-G, 9" 6-G, 10" 6-G, 12" 6-G
.277 (.270) 8" 3-G, 10" 3-G 4-G 6-G, 12" 6-G
6.8 mm 10" 3-G 6-G
.284 (7mm) 7" 3-G, 8" 3-G, 9" 3-G 4-G 6-G, 10" 6-G, 12" 6-G, 14" 6-G
7.5 mm (.305) 11" 4-G
.308 (.30) 7" 3-G, 8" 6-G, 9" 3-G 6-G, 10" 3-G 4-G 5R 6-G, 11" 3-G 6-G, 12" 3-G 4-G 6-G, 13" 3-G 6-G 8-G, 14" 4-G 6-G, 15" 3-G 6-G, 16" 6-G, 17" 3-G
.311 (.3105) 10" 4-G
.323 (8 mm) 10" 6-G
.338 7" 6-G, 9" 6-G, 10" 6-G, 12" 6-G
.358 (.35) 10" 6-G, 12" 6-G, 16" 6-G
9.3mm (.366) 12" 6-G
.375 9" 6-G, 10" 6-G, 12" 6-G
.408 (.40) 13" 6-G, 16" 6-G
.416 12" 8-G, 13" 6-G, 14" 8-G
.423 (.404 Jeffery) 14" 6-G
.425 W-R (.435) 16" 6-G
.458 (.45) 10" 6-G, 14" 8-G, 48" 6-G
.510 (.50) 15" 6-G 7-G, 26" 6-G, 32" 6-G, 48" 6-G

Long Barrels

Our standard length barrels are furnished as a 28" long blank that will finish up to 27". Most barrels can be ordered in a finish length up to 30". Only the following caliber/twist combinations can be ordered over 30" in length. Maximum finish length is 45" unless indicated otherwise.

Caliber Twist Grooves Max. Length
       
6mm 8" 3 36"
6.5mm 8 3 45
7mm 7 3 45
  9 4 45
.308 10 3 45
  10 6 45
  11 3 45
  13 3 34 W/.299" bore
.338 9 & 10 6 45
.358 12 6 45
.375 9 & 10 6 45
.408 13 6 45
.416 12 8 45
  13 6 45
.435 16 6 45
.510 15 6 45
       

Twist Selection

For help in selecting the correct twist rate for the bullet you plan to use please refer to the chart below. The rate should be based on the heaviest bullet you intend to use. We are also very willing to help you determine the correct twist. You may contact Dan with questions by e-mail CLICK HERE.

BULLET WEIGHT / CALIBER / TWIST RATE CHART

Grain/Cal .172 .204 .224 .243 .257 .264 .277 .284 .308 .338 .358
17-20 9-10                    
25 10                    
30 9 12                  
33   12                  
35   12                  
37 VLD 6                    
40   12                  
50-52   9 14                
55     12                
60     12                
68-69     9,10 13,14              
75     9   14            
80     8                
85     7 12 12 12          
90     7 10              
100       10 10   12 14      
105-107       8              
120         10 10   12 15,16    
130             10   14    
140           9 10 10      
150                 14    
140-160           8 10 10 12,13    
150-168               9 11,12,13    
150-180                 10,11,12    
160               9      
175               9      
180                 10,11,12    
200                 10,11 10,12 12,16
220                 10    
225                   10,12 12,16
240-250                 10 10 12
300                   10 12

The above chart is from our FAQ section. For more information about choosing the correct twist rate Click Here. This chart is based on jacketed lead-core bullets. With some monolithic and plastic-tipped bullets the above twists may be too slow. The reason for this is that copper and yellow-metal bullets are less dense than lead-core bullets and so with bullets of an equal weight the monolithic bullets are longer. And length has a lot of influence on twist required. The plastic tips on some bullets also add length without weight.

To read an article on bullet design and download a free program that calculates twist rate based on specific bullet dimensions Click Here

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