I bought 260ai reamer it has 120fb and bore rider going to use it on fresh built on a shilen match 1-8 twist and barrel is 28in long. Just wanted to know how much extra fps could get on 140 bergers. The stock is h-s tactical stock barrel is 1.250 to taper .800 on the muzzel. Let me know what any one things about this set up. I will get the gun in 2 weeks.