RE: Thompson Omega
I shot some 260 grain PB's and some 260 grain .451 Nosler Partition HG last Sunday. Both with 80 grains of 777. I was using a wooden fence post as a rest, so the groups weren't the tightest. But one can compare the two bullets realative accuracy. At 60 yards the Noslers produced 2"-3" groups, the PB's produced 5"-6" groups. At 100 yards the Nolsers produced 8"-10" groups, the PB's produced 12"-14" groups. The gun has a 1.5-4.5 scope on it. The PB's load nice and easy, but really aren't that accurate out of my gun. The Noslers loaded about medium, not real easy, but not real hard either.
On a side note, this was the first time I had shot the gun using a Sims recoil pad and it made a world of difference on the recoil.