Quote:
Originally Posted by Slipdigit  On an aside, when did the UK quit using spherical projectile weight equivalents (for lack of a better term) for gun size and start using bore diameter itself when descibing large guns? e.g. 6 pdr for a 57mm gun? |
'Twasn't spherical equivalent, 'twas actual. A 6 pdr A/T gun threw a 6 lb. shot in APCBC.
Using 4/3 pi r cubed and 7.8 gm/cc, an iron roundshot in 57mm would weigh about a pound and two-thirds.
Regards,
MikB