Sacrificed a misfired Gevelot No. 1 Long shot to find out the contents. 21.2 grains of shot (42 pellets so about No. 10 shot) ahead of 2 thin card wads and 3.2 grains very fine black powder.
Whilst it looks more impressive than the modern cartridges it has a smaller payload. “All hat and no cattle”.
I thought that the rosette crimped Kynoch .300 Rook was a shot load but as it only weighs 6 grains more than the uncrimped empty case on left it must be a blank for bird scaring.
The UMC .30 Rook case on the right is a scarce example of American production of this calibre.
These in Holts next sealed bid sale are shot cartridges for .360 No. 5 Rook rifles or revolvers.