I haven't put live rounds in it so I'm not exactly sure if the problem will correct itself with live ones. I have Swedishicon dummy rounds and they have the indented sides. I do not think that is the whole issue as the cartridges are just to long. The bullet tips catch on the lip of the front of the magazine well. The rear of the cartridge will go in and down at a steep angle after more than two are inserted. At this angle, the bolt just slides over them without catching on the rim to chamber the round. The cartridge hold downs also won't work at this angle so the third and fourth more or less just float around in the magazine but won't lift into the proper level. Probably cutting the front of the magazine well and polishing out part of the receiver well would do the trick.