Back in 2001 I managed to get invited to an Army firepower demo at Warminster on Salisbury Plain, a live-firing spectacle.
There were several hundred spectators (mostly UK & overseas military) seated in a grandstand and the show-stopper at the end (not that it wasn't impressive up until that point) was when an AS90 came roaring-up about 25 metres in front of the the stand, did a "handbrake turn" so it had it's gun pointing directly away from us elevated.
It immediately fired off three rounds in very quick succession, each of which felt like a slap in the face. As you looked down the row of spectators, you could see their hair blown backwards on each shot. The AS90 then turned and parked up behing the stand.
The commentator then started his commentary stating that right on the horizon, at 12 miles distant you could see 3 burnt out armoured vehicles as targets marked black, white, black and you should watch them closely. He finished talking and about 10 seconds later they each disappeared in a huge explosion in quick succession. Very impressive.
Of course, for all I know it could have been blanks & separate explosive charges planted under each target remotely detonated, but I suspect not.
Been to two of them with my cadets unit.Bloody Awesome mate!, Sounds amazing, This is an annual show then? Or is it not open to the public?. Sounds awesome!