Friend ran into a bug with his mosin when he used a 5 round clip to load it. Whenever he cycled the rifle with R it spit out a round into his inventory, even after firing that same round. The new round could be loaded back into the gun allowing for infinite use. May have been happening with the repeater rifle as well, as I did notice many single stacks of ammo in my inventory after it's use. This was in the lastest exp patch.