Wow, these guys were awesome to deal with. I ordered a new .30 cal 1-10 twist barrel. When I initially called I had questions regarding what twist I should use for the 208grn A-Max, 210grn Berger VLD and 210grn MK. I was originally going to go with the 1-11, however, Frank informed me I should go with their 1-10 twist barrel for those bullets. The bottom line, Bartlein was awesome to deal with. I wanted to give a shout out to Frank Green and Andy. They were very helpful. If you have any questions about their barrels, ask for Frank Green. W.