Just got new Savage LRP its chambered for 260 REM and it has 1:8 twist. I bough it with idea to shoot 140 gr bullets, but the way this chamber is cut I have to seat bullets to dip, this leaves less room for powder. I should probably get custom barrel, like Shilen or Krieger for specific bullet and I will probably do it. What I would like to know if gunsmith can modify factory barrel I have to handle longer bullets, what this procedure called and how much does it cost? Thanx