I have a Lakefield model 64b.I actually took it out yesterday evening after totally stripping it down over the winter and cleaning it.The gun will extract the spent casing but not feed one into the chamber usually every other round.The mag.still has good spring to it.The rifle will normally do this with lead bullets or if it has not been cleaned recently.I am using copper plated and started the season with a clean gun.I know these are the best rifles in the world.Does anyone have any answers to this problem?