ol .243 would be great, or even a .270 with a 100 grain bullet would be fine. if you get a 20 ga. make sure its not a single shot. those things pack a punch! 7mm-08 is nice.....maybe depending on shooting distance, a .308 with a light recoil bullet, or like they said earlier, a .357 mag, or a .44 Mag lever gun is nice too.
Remington 710 .270
Smith And Wesson M&P40
Mossberg 835 Ulti-Mag 12 Ga
CVA optima Mag .50 cal. Muzzleloader
1968 Browning recurve