I've got a model 7 in 223 that I had a Benchmark barrel on and I'm shooting 80 gr Bergera out of. I'd like to be able to feed them from the magazine without going to a detachable mag. There's a block welded in to the box that makes it too short to allow the longer bullets. Any suggestions? I've already cut and welded the block to give me .1" more length but any more and the follower has too much play