Do you have a scope? If so make sure everything is tight, mounting rings and base. What distance are you shooting? What other slugs have you tried? Most guns will shoot a particular slug better than the other. Go get a box of Lightfield Hybreds, Remington Copper Solids, Federal Vital Shocks, and about any other 20 gauge sabots you can find. Start shooting at 13 yards for a group. Don't worry about scope adjustment, shoot for a group. Find out which slug shoots the best. Then move out to 25 yards, then 50, and then so on. As you move further out you can tweek your scope. You just need to find out first which slug your gun shoots best. Good Luck.