JBS, its a 7.62x51! Here its "-----". Besides, in my rifles that have good mags I can charger load 'em with the rims in ANY position, including reversed overlap, and they will still end up in the mag the right way. DUDUD is really not required! Spent a couple hours messing with this myth, and it doesn't hold water! It would, however, keep the troops occupied w/ yet another mindless task.
Maverick, I tried multiple chargers, including 2, 4, and 6 "side protrusion" bump types of various origins- no dramas. Did not try 6.5 Swede ones though, they tend to be wider.