Caliber and Twist Rates
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The charts below list our complete cartridge offerings for AR-15, AR-10 and Bolt-Action rifle barrels. Twist rates are represented by the numbers in black: 12
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AR Barrel
Calibers and Twist Rates
12 204 RUGER 7 5.56 NATO 8 223 WYLDE 7.5 6mm ARC 8 6mm CREEDMOOR (NEW!) |
7.5 25 CREEDMOOR (NEW!) 8 6.5 GRENDEL 11 6.8mm REM SPC II 7 300 AAC BLACKOUT 10 308 WINCHESTER 12 300 HAM'R |
3 8.6 BLACKOUT 8 338 ARC (NEW!) 16 350 LEGEND 24 450 BUSHMASTER |
Bolt Action Rifle Barrel
Calibers and Twist Rates
-Please note that not all cartridges are available or advisable for use in all actions.
-(NO FIT) next to a cartridge name means that fitting service is unavailable for that specific cartridge.
-All reamer dimensions are to SAAMI specifications when applicable.
-We do NOT cut custom throat dimensions.
-All Ackley cartridge shoulder angles are 40 degree.
-280 Ackley Improved is SAAMI spec.
-We do offer fitting service for 300 PRC, but it is up to YOU to ensure that your magazine box can accomodate the cartridge. 300 PRC max C.O.L. is 3.700".
-Fitting service for 45/70 Govt. is only available for Siamese Mauser conversions.
-7mm BACKCOUNTRY maximum average pressure is 80,000psi. We will not produce 7mm BC barrels for any mil-surp rifle. If your rifle is not modern production, you should look for a different cartridge.
Click here to learn more about our Barrel Installation Service.
9 17 REM FIREBALL 12 20 VARTARG (NO FIT) 6.5 | 7 | 8 | 9 | 12 | 14 221 REM FIREBALL 7 | 8 | 9 | 10 6 x 45mm 7.5 | 10 250 SAVAGE |
8 | 9 6.5 GRENDEL 8.5 | 10 6.8mm REM SPC II 8 | 9.5 7mm-08 REMINGTON 8 | 10 | 12 300 AAC BLACKOUT 10 8mm MAUSER (8x57) |
3 8.6 BLACKOUT 8 | 10 338 ARC 16 350 LEGEND 14 35 REMINGTON 12 | Discontinued 9.3 x 62 (Discontinued) 8 375 RAPTOR (NEW!) 12 375-338 MAG (NO FIT) 16 400 LEGEND (NEW!) 15 | Discontinued 416 REM MAG (Discontinued) 24 450 BUSHMASTER 14 | 22 45/70 GOVT |