Who would you recommend in Canada to tune a Marlin 45-70 JM that has feeding problems.I thought it was the magazine spring .Perhaps the previous owner stored it loaded but upon taking it apart and giving it a gentle stretching it is no better.The shell in the tube comes 7/8 out onto the lifter/carrier and sits there locking up the action. It can be nudged with a screwdriver behind the rim and it pops into place only to do the same next round.Not keen on Remlin parts replacement.......Harold