Patrick Chadwick

The original black powder load for the .303 Britishicon was rated at 19 tsi chamber pressure, switching to smokeless powder the first loading for the .303 British was 16 tsi, and this increased over time to 17, 18 and 19 tsi again with the final cordite loading.

SR-4759 powder is a bulky powder designed for reduced loads, it has a large grain size with greatly increases loading density and enhancing uniform velocity.

Below is a .303 case that is over ¾ full of SR-4759 with 20 grains of powder.



From the Number nine Speer reloading manual below.
(See loadings on bottom two rows)



If the .303 British can make the change over from black powder to smokeless powder other cartridges can also take advantage of “smokeless powder”. You just have to know which powder to use, smokeless powder isn't “dragster fuel” when it “burns slower” and creates a more even longer pressure curve than instantaneous burning black powder.



Patrick, please remember "cheap bastards" are not "stupid bastards" and cheap bastards have MORE fun.



NOTE: A stupid bastard is the guy that triple charges his rifle cases with 3x18 grains of 2400 pistol powder, adds Cream of Wheat and the pressure wave kills everyone at the shooting range.

(Sorry Patrick, the Devil made me do it)
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