Hillbilly: I notice the same problem on a customer's 770. Most of the drag on his was caused by the bolt shroud and cocking piece. You probably could lap the threads and contact surfaces, but it might be the best to leave it be.
Some might tell you to get another rifle, but the 710/770 are not all that bad. There are a few things I don't like about them, but they're serviceble and inexpensive.
The owner of the 770 killed a 10 point with his, and that buck was as dead as any shot with a $1,000+ rifle.