My Genesis shoots Hornady FPBs well with 100 gr Pyrodex RS.

Whensomeone says their gun won't shoot well, I always suspect the scope/scope mounts. If you can remove them and shoot a few at 20 yds with iron sights, you can determine if you have a scope issue. If it is not the scope, I would switch bullets until you find something that shoots with your T7 pellets. I suggest 2, 50 gr pellets.