Shot my .224 Valkyrie last week with with a 70 grain brass shells. I couldnt find anymore so I went with a 60 grain Nickel plated brass. Well everytime I shoot around the next round gets jammed. Shot 4 times and it happened every shot. Its jams so hard it dents and bends the next round. Does Nickel plated brass make that much difference or is there something else I should be looking at?