I have a Browning A-Bolt 7rem.mag w/Boss. Currently I'm shooting Win. Supreme Fail Safe in 140 gr. Only shot at 2 deer with it & dropped them both 1st. shot. I have'nt really messed with my boss, except setting it by the chart that came with it according to bullet wt. It shot pretty good & consistant, but I would really like to drive tacks with it. Just like to see if anyone else has one like this & how they have theirs set up. I know best way to do this is go to the range, just had'nt the time lately like I'd like to. Hunt safe & support the N.R.A. JSHARRIS51