I suspect the hold open latches on the doors look as if they were over engineered because the doors were heavy (they are armoured) and the back blast from the gun could easily slam the doors shut. That wouldn't be at all funny if you were standing behind the limber setting a fuse.
I know a couple of people who have had a lot to do with 25 Pounders and can probably say for sure what the reasoning was - I'll check with them.
Regards,
Charlie
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