Lead Shot Sizes (above) applied to British cartridge loading, also showing the metric equivalent in mm.
The Conversion Table below shows metric and imperial load equivalents.
Imperial Metric Equivalents
2 1/2″ 65mm / 67mm /67.5mm
2 3/4″ 70mm
Suitable Ammunition for British Shotguns
Guns Stamped Game Loads Practice Loads
2 1/2″ Game Bore Pure Gold 30g Express HV 24g
2 3/4″ Hull Sterling Game 30g Eley Olympic 24g
3″ Eley VIP Bismuth 46g Anything