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- Sep 25, 2019
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That's true about "not always 100%".I believe what Mr. Tom was trying to help folks understand: volume to weight ratio changes with lots/bottles of BlackHorn209. And you don't know the exact ratio until you throw some by volume then weigh them...
The powder manufacturer has warned in the past that they work each lot to be volumetrically equivalent to black powder. Plenty of other posts you can search up on this site show folks have experienced differences lot to lot of the volume to weight ratio when changing lots. Do a search or two; you will have hours of reading here.
As the manufacturer's instructions show that you should go by volume with BlackHorn209, its generally accepted as a best practice to work up loads by volume. Then if you must go by weight: weigh the charge (that is allowable by volume) and only use that weight to volume ratio for that bottle/lot.
You may hear 70gr weight = 100gr by volume... but its not always 100% accurate. The best safe way to do it is start by volume then weigh it, then repeat and average and then know for sure for that bottle/lot what ratio to use... and never go over the max charge of 120 gr by volume (says on the bottle) and never go over your rifle's manual's listing of max charge!
Your mileage may vary, but the advice above it safest and meant to help keep you safe.
I checked my BH209 notes and my 100 gr by volume consistently weighs 71 grains.