Well, I tried the federal nosler partitions in 140gr and they are a no go from what I've seen so far. Didn't get a very good grouping out of em at 100yds. Maybe 4". Two of the rounds out of the 20 i fired jammed as well. Hopefully that's just my rifle telling me it doesn't like that particular round and not a problem with the gun. I won't know until I try out some different ammo. Just thought I'd give an update. Thanks for all the info everyone.