I bought a fully rifled slug barrel for my Remington 870 and went to try and sight it in today. First off, let me say that with just a 2 3/4" sabot slug cranking from the muzzle at 2000 fps, kicks like a mule! I would rank the recoil up there with that of my .257 Weatherby Magnum, lol. After mounting the barrel and the scope I started at 50 yds. and it was only about 4" from the bullseye low and left. I dialed it up and over and laid 2 rounds about a 1/8" from each other almost touching the 1/2" dot, dead center. Moved out to 100 yds. and then it got interesting. The slug rose about 3" from 50 to 100 yds but also went right about 4".
I redialed for windage and elevation and cranked one in right next to the dot. Fired 2 more rounds and they both rose about 2" and almost touched, I fired another round and it went left. Don't really know what happened but i will need to shoot some more to find out but I will have to buy some more ammo before I can do so.
Born to hunt and fish.