1943 US made Enfield

[browningautorifle]

Is acetone interchangeable with mineral spirits and turpentine or would it be too aggressive?

Acetone melts many things and is different from the others. Mineral spirits and turpentine I think are to mix with paint and thin it more... I would just use something like 1850 furniture stripper to reduce the varnish and then rinse off. Don't leave the wood wet, use paper towel to dry and then easy dry it after. No fast heat or you'll warp it. You'd use acetone to remove the lot numbers painted on an ammo can.