a 1-12 with .070 free bore .271 neck. Decided to back off the 1-8 twist with 100+ grain target bullet suggestions. It will be a prairie dog gun first and just poking holes in them with a heavy match bullet takes away some of the fun. The 1-12 is more optimal for the 60-90 grain varmint bullets. Most shots will be 600 yards and in. It's not permanent so with a couple years and a few thousand rounds of experience maybe I'll rebarrel to a 1-8 for a little more distance with the heavier bullets.expiper said:the BR will serve you well...what twist--Free bore-Neck Dia....??,,,those are the biggies...Roger