I think I'll let someone else shoot it
a .90 [corrected: .95] caliber rifle. Recoil: 2,777 foot pounds. Cost of ammo: $40 a round (you could probably handload it for $30, if you could find a press). And legally it's a destructive device. No wonder that the manufacturer has built only three.
(It's also amusing how the British press has trouble describing guns and ammo).