.303 American Standard

Why is one of these Mk VII .303’s marked with ‘AS’ while the other is not? The only slight difference that I can see is in primer contour - is that what ‘American Standard’ means?

As I am sure you are aware, in British terminolgy “Standard” rounds are those made to close tolerances to act as a reference round against which normal production is tested.

“AS” simply means these were rounds made to the American standard (i.e. with NC propellant, shorter bullet with no aluminium tip etc.) against which the normal American production was tested.

British standard cartridges of the period normally had no special marking other than what was marked on the packets, usually just stamped “STANDARDS”, but later rounds from around WW2 were marked with a clear annulus varnish.


Excellent! Thanks Tony.