I have had a feed problem with my Marlin since new, loading from the mag tube, the round would pick up & then go halfway through the cycle, stopping until the lever was backed off slightly & then carried on through the cycle, tipping the rifle slightly leftwards would help too, I trawled the net & landed on the Marlin owners club site, found the fix within a few minutes, simple matter of gently bending the extractor claw away from the bolt body, cartridges go through now like a Sako turnbolt. Result.