Gary,
Is something wrong with the scope? If it is OK, except for the name, I would just use and enjoy it. The 7x65R is a very good caliber, in 280 Rem/30-06 class. I also prefer 57mm case, but only because we hunt small deer at close range. I agree with you about 12ga drillings being too heavy, and about short barrels being better, your barrel length is OK, I wouldn't want longer ones, though. Also, drillings are shot with your head up, like a shotgun, it is a shotgun. Don't worry about a "cheek weld", you will be hunting, and likely have only one shot.
Mike