Does anyone have a source for a diagram (with dimensions) of the bullet in the Mk VII cartridge?
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Does anyone have a source for a diagram (with dimensions) of the bullet in the Mk VII cartridge?
https://www.milsurps.com/images/impo...m_Treati-1.jpg
Plate CIX in "Treatise on Ammunition" 10th Edition 1915
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https://www.milsurps.com/images/impo...G20small-1.jpg 160g
Here's some other links...
1937 Complete Guide to Handloading (by Philip B. Sharpe)
1905 Treatise on Ammunition
1915 Treatise on Ammunition
.303 British Maximum cartridge drawing.
Regards,
Doug
That 1909 160gn job may have been one of the experimental bullets that lead to the Mk7 proper. The lack of cannelure may be one sign of this, though collet crimpers will form a cannelure in the bullet the final neck-crimping stage, as users of the LEE "Factory Crimp" dies can attest.
Interestingly, its length is within a whisker of the final Mk7 bullet, once again indicating that the engineers knew that it had to work MECHANICALLY in ALL service weapons, especially machine guns. The light weight indicates that they were going all-out for velocity.
The little note referencing a U.S. design may, in turn, be a pointer to one of the American responses to the appearance of the German 7.92mm "S" ball projectile, circa 1906.
I have a few "fragments" of drawings for the Mk7 bullet, but have not sat down and done a full search to see if there is enough data to pass to a bullet-maker.
How are you Canadian folk getting on with any "conversations" with your ammo makers. At the moment, the big problem in the US seems to be that bullet makers, or at least the ones who can make FMJ projectiles with compound cores, seem to be a little busy on other production.