Hi David,
The crux of the matter was the short barrel, no shield, light weight and no traversing platform, all of which contributed to, at firing, the gun bouncing and getting way off line after each shot and the mighty back blast/shock wave with each shot with the high discomfort for the crew that resulted.
A few shots were bad enough, but apparently the firing a mission was particularly hard on the crew: headaches, ears ringing, etc etc
Doubtless Bob, who has a direct line to an old gunner with Short experience, can provide more, but I think the above pretty much covers the main aspects as I gleaned them from earlier interviews.
Mike C
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