HONESTLY....my 870 mag.shoots straight at 100yds..and I only use those 2 3/4 inch Wnchester slugs..the group is 3 inches or less. I shoot them out of the Improved Cylinder choke using the 50.00 Gobble Dot sights.
BEST SHOOTING 12 GUAGE I'VE OWNED..our range only goes to 100yds.so that;s as far as I've tested it.