I think the key is that the "final push" on a round varies. The first four are being "pushed" by a cartridge - which is not exactly the same shape as the follower. The fifth round is located solely by the follower which must present a slightly different line of contact to the round about to be chambered. This could/would present enough of a different 'tilt' to cause the "different than designed for" bullet shape to come into play. The difference must be very slight because some rifles feed 180gr. bullets and others don't. The army didn't care, because the round the gun was designed for fed flawlessly - barring damaged parts. Off the bench, you can single load. In normal hunting, you should be fine, as the deer is supposed to be down within four shots (chuckle!) but if hunting something dangerous (feral hogs for example) you'd want to be sure that EVERY round will feed EVERY time.