I had the exact same problem and like others said, it is definitely a stock bedding issue. In my case, (with a new Boyd's stock) there was simply too much wood between the bottom of the receiver and the top of the magazine. In other words, the stock was too thick in that area. This caused the receiver and the trigger guard to be slightly farther apart than needed. It wasn't much, but it was enough to keep it from feeding correctly. It's been a long time, but as I recall, the tips of my bullets were catching on the little slot between the forward magazine and the receiver. There shouldn't be a gap there, or if so, mine was too big. I'm betting yours is too.