The BRI slugs only carry about 950 ftlbs of energy at 100yds. They will be travelling at about 990 fps.

Conventional wisdom calls for 1000-1200 ftlbs for taking deer sized game.

So, yes....it will be adequate. However, with so many more powerful, (and flatter shooting)options, it would not be my first choiceina gun that I may be required to use at 100yds on live game.