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Zonie said:tac
You can measure by volume and check those measured loads by weight ONLY if you are using real black powder.
ALL of the synthetic powders weigh less per cubic centimeter (or cubic inches) than an equal volume of real black powder.
This is the reason your weighed measure of Pyrodex P weighed less than was expected.
These less dense synthetic powders are designed so that when measured using a volumetric measure they will have approximently the same amount of power as an equal volume of real black powder.
This allows us to safely use the Traditional volumetric method of measuring a powder load with the synthetic powders and ending up with roughly the same velocity and pressures one would expect from that amount of black powder.
As I mentioned above, the 777 powder has about 15 percent more energy (and pressure) than an equal volume of black powder.
This explains why Hodgdon recommends reducing the volumetric load about 15 percent under a black powders volumetric load to achieve similar results.
Sir - I fully understand that, hence the comment in my post above.
I fully agree with the poster who noted that he could get around 40gr of BP and a ball into the chamber, as I have been around to a friend's house and just done it myself - having the spoil the charge afterwards as we cannot shoot in his apartment.
However, notwithstanding the difference, please tell me how anybody can get 53gr of ANY powder into the chamber of any ROA?
tac, still puzzled.
BTW - we also measured my loading measure, the usual DGW all-brass doo-dad with the sliding piston, and a charge of 80gr of FFg in THAT weighs 89gr. Just thort you'd like to know :wink: