Reference:
Specification, S. A./462-P
Rifle No 1 Mk111
1938
42. Rifle, testing of, -
Every rifle will be fired at a paper target, with full sight, leaf and slide down, at a range of 100 feet, from a mechanical rest. trial shots will be fired, if necessary, and the foresight will be adjusted for lateral deviation, or will be replaced by another foresight to correct vertical deviation. Then five rounds will be fired from the magazine; if the rifle fails to put four shots out of the five into a rectangle 1- inch broad and 1 1/2- inch high, or if the blade, foresight, requires to be set more than .03-inch to one side of its normal position, the rifle will be returned to the manufacturer.
(My 2c worth: These are mass-produced, battle implements, NOT bench-rest rifles!)
To continue, ammo Note from the same source document:
43. Ammunition. - The ammunition for the above test will be specially selected to give good figure of merit.
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Thus, one needs "good" MkVll BALL to do the job properly. Random, "odd", "not-quite" Mk Vll etc. just won't cut it. MkVlllZ is not kosher, neither are home-brews using fancy boat-tailed HPs.
Had yet ANOTHER discussion with some chaps at the range this morning: apparently one of the Oz bullet-makers has twigged that there might be a market for a 174gn, flat-bases hollow-point with the same external profile, and, approximately the same static "balance" as MkVll ball.
I'll believe it when I see a box of samples, but it MAY be a start.
NOBODY is going to tool up to make "proper", compound-cored, MkVll projectiles unless someone stumps up for the first million.