Members of the Shotgun Shooting Fraternity in the UK are NOT allowed to have ammo ie Shotgun Cartridges with 1 slug, to have such ammo you must first hold a fire Arms Certificate.
I once altered two Alphmax 12g Cartridges and fitted each with a single stainless steel ball, crimped in and held with sealing wax, fired from a single barrel BSA with a true cylinder barrel, the target was a Morris 1000 Saloon, at 30yards the ball went straight through the boot, rear seats front seat dash board and exited the bull nose part of the bonnet , when fired from 45 yards the ball was captured by the dashboard,
No 4 game shot at 50 yards didnt penetrate the door panel, but at 20 yards it left a hole like a drunken woodpecker had been at it.
and finally
When I was much younger and during a spell of beating(game bird chasing)for our then prime minister Harold Macmillan whilst he was shooting at Pen-Y-Ghent in North Yorshire, he peppered three of us young beaters with No 5 Game shot at a distance of some 120 yards, it felt like hails stones hitting us, untill we took our Plastic waterproof tops off and found many small holes along with the corresponding shot dropping out from our wool jumpers, to wit the PM once aware of this incident gave us a White Fiver each for the shock he had caused us!
PeterR-B
Vfr