My goto rifle for big game is a Winchester Model 70 in a 30-06 and Swarovski Z3 4-12. I shoot Federal Premium 180gr Barnes TSX.
If it's shotgun only I use a Remington 870 with a Hastings rifled barrel, Leupold 2-7, Federal Premium Saboted slugs with a Barnes Expander.
Muzzleloader is a TC Encore with 295gr Power Belts.