Ron Pinkston, of JagerPro, uses DPMS or R-25 308s with Federal or Hornady premium ammo in their 18" barrels. Full penetration at most angles on hogs up to 400# at ranges of 50-250 yards. Until recently, they used 180 Partitions, but I understand they are using Interbonds and GLX, also. Using that short of a barrel, I'd stick with Partitions.
Edit - with a 20" barrel, I'd still stick with Partitions for the penetration.
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