Anyone out there know the approximate serial range when Savage started using a 2 groove barrels? I'm looking at buying my first No.4 Mk1(no*) and want to know if an 11C prefix Savage would be 'as it left the factory' if it had a two groove barrel. It also has a 300/600yd battle sight and button cocking piece for what its worth - would that also be 'correct' for an 11C prefix serial numbered savage?