OK - here's your top choices:

Rifle: T/C Omega

Bullet: T/C 250 Shockwave
Barnes 250 gr. Expander MZ with Harvester Crush Rib sabot

Powder: 100 to 110 gr of ffg Triple 7
100to 130 grain of Pyrodex pellets

You can use this gun with this load for just about all North American general purpose big game hunting. Follow Cayugad's advice on all the loading and cleaning procedures. Life should be good. Roskoe.