Sounds like you figured out the primer issue. As for extraction, the hard bolt lift should be a hint - your loads are suddenly too hot for your gun. If it's the same load you've been shooting for awhile then I would do a thorough cleaning of the chamber/neck area and also look/feel for a carbon ring just forward of the chamber. Carbon (or sizing wax) buildup in the chamber can make extraction harder, and a carbon ring in the bore can cause an increase in pressure.