If he's made the pip hole bigger by himself then I'd guess he's strong and he's really trying to get out. Sounds like it might be too dry for him to turn and zip. Either that or he's too big to get himself moving in there. I've never hatched turkeys but I'm assuming the helping procedure is roughly the same as for chickens.
Bator into warm damp room, egg out, pick away very small bits of the shell very slowly and carefully, moisten the membrane with warm water as you go, (a wet q-tip is good for this as you have to be careful not to actually drip water on the beak in case the chick inhales it and drowns) and if you see any blood stop immediately and put the egg back in the bator for a few hours, wrapped in a damp washcloth.
If you decide to help, good luck!
