They almost sound like the old Kent Gamebore White Gold XLR shells.
( from my notes on them, after contacting them some years ago for the pressures)

White Gold XLR, plastic case,
65mm (2 1/2")
21gm (3/4oz), #8 shot (312 pellets .085"-.090") (my count)
Fibre wad
1250 ft/sec
7,975psi