It's the same size as the rifle's bore so .303 on an Enfield or Ross rifle. With virtually no barrel they wouldn't want to restrict the cartridges gas emission on firing. Recoil would tear the device from its mounting.
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David Gordon - MVPA # 15292
'41 Willys MB British Airborne Jeep
'42 Excelsior Welbike Mark I
'42 BSA M20 Motorcycle
'43 BSA Folding Military Bicycle
'43 BSA M20 Motorcycle
'44 Orme-Evans Airborne Trailer No. 1 Mk. II
'44 Airborne 100-Gallon Water Bowser Trailer
'44 Ford T-16 Universal Carrier
'44 Jowett Cars 4.2-Inch Towed Mortar
'44 Daimler Scout Car Mark II
'45 Studebaker M29C Weasel
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