Along with a careful examination of the spring and follower, I would also suggest you consider a gentle polish of the feed ramp. Fine emery and oil. Don't change the shape, just make it smooth. My Mark V 300 Weatherby Mag started life as 30-06. A Customer purchased it from the PX while in the Navy,. never shot it . He was aboard ship. I bought it from Him. I purchased a new magazine box ,and spring and follower from Weatherby, when I Purchased a 300 Weatherby Mag barrel, from another customer. That guy was re barreling his nearly new 300 Weatherby to 340 Weatherby mag. He was convinced, after he shot his first Elk, the 300 Weatherby was just not enough gun for Elk. He was angry because he needed a second shot. He asked $125 Dollars for his Mag na Ported 26 inch #2 Weatherby Barrel, barrel, I said OK!!! Ill take it. Yes!!!The Bolt face was a magnum Bolt Face of the correct size. I never had a feeding problem , or any problem, after the new parts were installed ,and massaging was done. I had the sights and barrel band installed , just because I can't leave stuff alone.