My guess would be that the fools in the plant where it was manufactured put a W296/H110 sized charge of a Bullseye or Red Dot equivalent powder in those cases.In other words, they probably put a huge overdose of very quick burning powder in the cases, which would certainly result in this kind of thing.All the more reason to go to handloading, thereby permanently untethering yourself from defective and (in this case) dangerous factory ammo.Why anyone would use Chinese ammo is beyond me, even if it is cheap.If you must use factory, Remington and Federal both make reasonably priced ammo.