No doubt a 2" group at 100 is acceptable for deer hunting but only out to about 150 yards. Now I have two guns that shoot around 1" and I know for a fact that one will hold that to 200 yards. Never shot groups with the other at 200 but recon it will be under 3" at 200.
With Shocky Gold I tried 3 different bullet combos. Yes, I compressed the powder. No there was no oil in the barrel. I was lucky to get 5" groups with that junk. Pyrodex, 777, and and BH209 all provide great accuracy with the gun. The Shocky Gold was a golden turd imo. I left what was left at the range for someone else to try so they would know not to buy it.