drdi = I have to agree. 2 1/2 oz of shot is a lot of shot. And it takes a lot of pressure to get it moving and part of the excessive recoil you are experiencing. I suggest you go to Walmart and pick up a slip on recoil pad, drop you charge down to 80 gr and try no more than 1 oz (preferrably 7/8 oz) show wads. That should be more than enough medicine for turkey out to 25 yds.
Also to ease the recoil a might, you may want to consider not shooting off the bench. Try standing and shooting offhand. Pattering a shotgun is brutal when using heavy loads. And I've seen more than one burly guy wince at the recoil of a heavy turkey load. I know its not on my list as one of my favorite things to do.