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Nice high rate of fire, around 1,000 rpm, if memory serves. I don't think the early Spitfires and Hurricanes had more than 15 secs of ammo when full-up.
Too bad it wasn't found much earlier, or much later than now, when hopefully idiots wouldn't prevail and destroy such a magnificent piece of engineering by neutering it.
It is amazing how thick the barrel jackets are on the 303 brownings. The air line goes into a 'flapper" type device that mounts on the bottom of the gun which fires the gun. The barrels are not that thick, so they really heat up.