Calibers


Caliber # of Grooves Bore Diameter Groove Diameter Twist Comments
.20 5 .199 .204 1-9,10,11,12,13 Note 1
.22RF 4, 5, 6 .217 .222 16 Note 1
5.56mm/22 CF 4, 5R .218/.219 .224 1-6.5 thru 1-14  
6mm 4, 5R .236/.237 .243 1-7 thru 1-15  
.257 4, 5R .250 .257 1-10  
6.5mm 4, 5R .256 .264 1-8 thru 1-10  
.270 4, 5R .270 .277 1-10  
7mm 4, 5R .277 .284 1-8 thru 1-10  
.30 cal Tight 4, 5R .298/.299 .3065-.3080 1-8 to 1-14  
.308 4, 5R .300 .308 1-8 thru 1-18  
8mm 4, 5R .311/.315 .323 1-10  
.338 5R, 6 .330 .338 1-9 thru 1-12  
.375 5R, 6 .366 .375 1-12 thru 1-14 Note 1
.416 5R, 6 .408 .416 1-12 thru 1-14 Note 1
.50 7, 8 .500 .510 1-15  
20mm 8, 9, 15 * * * Call for pricing and details

Note 1: Due to the demand of other calibers, we are not accepting orders for these calibers at this time

  • Bore Diameter tolerance = +.0005
  • Groove Diameter tolerance = +.0005
  • Bore and Groove uniformity along entire length of barrel +.0001/-.0000
  • Twist uniformity is best in the industry. Twist can be carried out to the 4th decimal point. Example: 11.3642 A Bartlein Barrels Exclusive!
  • In addition to Standard/Conventional Rifling, we can also do 5R
  • Non-standard twist, add $20.00
  • Non-Standard Bore/Groove dimensions, Please call
  • Non-Standard Groove width or number of grooves, Please call
  • Any barrel groove not listed, add $100

*** More calibers will be added as tooling gets completed.

If you have an immediate need, Please call for more details.