I shoot a Remington 870 20ga. with a Hastings 24" fully rifled cantilever mount barrel. I have a 2.5X20 Simmons scope on it, and shoot Remington "buckhammer" slugs. Its very accurate for a shotgun out to about 100 yards. This is what I have to hunt with in the NY southern zone where i live.
I use an 870 12ga with a smooth bore and the remington managed recoil rifled slugs. Gets the job done with no problem. A box of 5 cost less than $3.50 at Walmart and the kick is practically non-existent. But I wouldn't push them beyond 100 yards for deer and 50 yards for bear.