I usually replace them with a decent aftermarket lug of either .225" or .250". The thickness doesn't matter, the factory .187" lug is plenty strong but it's not likely to have parallel surfaces. Surface grinding a factory lug is fine too, just whatever it takes to get it parallel. That assumes the action has been faced true which I would always have done with a remington action. If you don't have the action faced then I wouldn't bother with an aftermarket lug.
