Alot of good barrels out there. I've got rifles with Broughton,Rock,Hart,Shilen,Chanlyn,K&P,Lilja,Kreiger plus afew others. I'd use a 1/14 twist , 24" to 26" in a Rem Varmit contour if matching exist varmit contour. If you don't have a gunsith lined up I'd send it to either Hart,Shilen or Kreiger and have them chamber one of their barrels. Bullet pick up speed with a longer barrel and length helps with certain bullets. I've got a Shilen SS select match 1/12 twist barrel on a 22-250AI and I've only shot 55gr bullets in that rifle and I'm getting ready to order a Kreiger 1/14 twist for a 22-250 for the 50gr bullet and it will finish at 26" or 28". As most have said a good gunsmith is important and sending it to a Barrel manufactor that offers chamber is a sure bet of getting a good job. I haven't tried them yet, Lawton is making a good barrel either a cut or button barrel . I'm not too high on Pac-Nor barrels. One thing also in using one of the Manufactors that I mention is they will make sure the action is square if not they will let you know and what the cost will be and if the action isn't right or cann't be squared they won't put a barrel on it. Just my .02