I would also recommend loose over pellets, BH209 or T7 IMO. If you must use pellets, I've actually found that Pyrodex pellets tend to be more accurate than T7 pellets for some reason, and I've heard that from other people as well. But loose powder is much more versatile and cheaper.

As for your bullet choice, I prefer the 200 grain Shockwave myself, but many, many deer have fallen to the 250 unbonded as well. If you use the unbonded version I would not recommend using max loads of powder. Something in the 90 - 110 grains of loose powder should be good.