Check the chamber length. It might be 2 9/16" at that date. If so there will be a slight increase in pressure shooting 2 3/4" loads. This averages about 200 psi. That also increases the rearward force which is tough on the wood behind the locks. Sidelocks crack here. Be sure to keep the rear screws tight. When they loosen, they are a cause for stock cracks. It is wise to remove any oil soaked in the stock. Be sure to have a qualified gunsmith remove the wood. It is a b*tch on LC's. Glass in the stock and there will be no future cracks.