I also have the 870 express magnum and shoot the hornady sst sabots out of it but I rarely hunt with it. I will take my muzzleloader any day over my shotgun. Yes, you only have one shot but then again I can reach out so much further and more accurate with my muzzleloader. Also, hopefully you only need one shot. I shot my biggest buck last year at 200 yards with my knight muzzleloader. Hornady makes sst bullets for black powder rifles too which is what I use. Very deadly combination in my opinion!