Hello.....I shoot a Thompson Black Diamond .50 cal with a Leupold M8 2.5X28 scope. I use 90 grains Pyrodex RS and a 260 gr Winchester platinum tip saboted bullet. This is the best load I have found for "my" gun. It's sighted in an 1 3/4" low at 100 yards, puts me 2 1/2" high at 50 yards and dead on at 25 yards. I have shot numerous bullets and loads through this gun and settled on this. This particular load gives me very consistant groups at these ranges. I was wondering, what the energy would be with only 90 grains of powder at 100 yards. As far as I'm concerned the 150 grain magnum loads don't show me anytihng in accuracy. If I want to place a shot through a small opening at 50 yards, I lack the confidence using the 150 grain charge. I just worry whether or not 90 grains is enough powder to take down a deer at say 150 yards or beyond. I took two deer with the 90 grain load during the Massachusetts Black Powder season but both shots were around 50 yards. I wasn't sure if anyone had info on a similar load out beyond 100 yards. Thanks a lot.......John