I have an Enfield No. 4 Mk. 1 that my grandfather gave me. He said it hadn't been fired in about thirty years, so after a passing inspection by the local gunsmith, I took it to the range and found a weak main spring. 2 out of 20 shots (Remington ammo) required a second strike to fire. I ordered another spring and replaced it, but now it won't feed properly. The rim of the rounds catch on the firing pin and are pushed at an angle into the chamber. Has anyone ever heard of this, and is there an easy fix? Thanks in advance.