Fairchir

My dad bought the gun in 96/97 and he died in 98. I recently got it and wanted to make a turkey gun out of it. Out of a Caldwell Leadsled, it was 2 feet low at 30 steps. I put the truglo gobble dot pro sights on it and with the max adjustment the top of the pattern is just hitting the target. Although it has nothing to do with it, I have the A shim in it which should have the highest POI for wing shooting. Since I am aligning beads for turkey hunting, I don't think bending the barrel is the answer. I have shot so many rounds of different types of ammo. I hate to give up on this gun. What should I do?