smudge,
the only firing offensive mode that I believe was ever trialled was the GPMG 'gunship'.
The only 'bang' trial over the ramp that I am aware of was the mines for use during Op Corporate. We have cover both these in earlier posts. There is of course no reason why we could not have dropped other ordnance as did the USAF. But when doing the HEART job I did not find any evidence of even the suggestion of such a trial
I once suggested that the APFC with an impact detonator would make a good inprovised weapon !
I suspect dragartist would count the MSP as a lethal ramp dropped bit of kit !