I have an H&R Ultra Slug Gun and mine shoots the 2.75" Hornady, Win Partiton Gold, and the 3" Rem Accu Tips all very well (1.5-2" group @ 100yd). One thing with my gun is it tends to shoot better groups after I have shot 3 or 4 rounds - I guess the "fouling" in the rifling helps. Even though it is a heavy gun, it still has a good amount of recoil. 2 years ago I put a Nikon Omega scope on mine and I really like the extra eye relief with a gun that has heavy recoil.