On another forum, the consensus seems to be these were NOT military surplus SLAP rounds but aftermarket reloads using SLAP like components. This ammo sells for really big bucks so fakery is common (Should not surprise this forum) Several failure modes are possible. I do not have an opinion on the design of the breach. But if I was to want a 50 Browning, I would want to see some really big locking lugs somewhere and maybe a pressure relief path
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