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Pressure is a funny thing. Barrel diameter and the bullet blocking it while it travels out while seems fast to us, in the pressure world is an eternity and not fast enough to bleed off the access. The speed at which pressure builds on fast burning powders is phenomenal. Think about how big a 223/556 round is and then imagine 60k psi.....to put it in perspective a C5 cargo jet loaded to Max 840k sitting on concrete ramp exerts roughly 1/32 of that per tire(28 tires total) ....now focus all that pressure Into a much smaller area. You get the picture.
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