My problem is the striker keeper screw on my bolt will not come loose.  I have tried for months and I know there is Cosmoline in there.  I might have stripped the screw as well.  SHould I just take it to a gunsmith and have him look at it or is there another way.  It just will not come undone.  Any ideas?

I have all matching numbers on the rifle but a new bolt or would let me shoot Surplus in it.  Also I will probally need a new striker keeper bolt screw for it.  midway?