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BangmanX
 Senior Boarder
Posts: 70 
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Greetings! First let me say how glad I am to have found this newsgroup! I have a T/C 50cal Hawken Renegade. My Deer load for several years has been a 320gr. Maxi-ball with 90 grains of Pyrodex RS. For years I have been under the assumption that because the Pyrodex bottle said 'the FFG equivalent', that 90 grains were truly equal. I lost my original T/C owner book in a move but i'm pretty sure that 110 grains was the maximum recommended load. I purchased a book entitled ' The Blackpowder Loading Manual from Gun Digest'. In it, there is a table that shows the Pyrodex RS grains measure. If I'm reading this correctly, the 90 setting on my measure is equal to 68.2 grains. 68.2 grains of WHAT? FFG powder? Does this mean I've been shooting a very light load? The table list the 120setting as being 88.0 grains. Is this what I should be using? It seems like an awful lot of extra powder and i really would rather not blow my own head off. Thoughts please and Thanks, Robert
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BangmanX
Senior Boarder
Posts: 70
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I think you're confusing weight vs. volumetric measure. Grains can be used to measure both weight and volume (just like ounces can measure either weight or volume). Pyrodex is equivalent BY VOLUME to black powder. So if you have a 90 grain volumetric measure for measuring your powder load, you can use it with Pyrodex and get the same results as you would with black powder.
However, Pyrodex is less dense than black powder, so those 90 grains (by volume) of Pyrodex will only weigh about 68 grains if you put it on a scale. I suspect your loading manual measures weight of powder, not volume.
Arguably, the 'correct' way to measure black poweder loads is by volume, so a one pound can of Pyrodex will let you shoot more than a one pound can of BP.
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Glinglet
 Senior Boarder
Posts: 69
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But is 'one pound' of Pyrodex really 1 lb or is it a 1 lb equivalent?
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coumputerguy
Senior Boarder
Posts: 61
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If you've been shooting that load, has it worked? If so why change now?
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eleazar
Senior Boarder
Posts: 64
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The number expressed is in grains of WEIGHT for a 90 grain VOLUME of Pyrodex. Pyrodex is less dense than black powder so weighs less with a scale for a given measured volume. You will note that Pyrodex says that it is volume equivilent of Black Powder.
Keep on going, it has worked with that load so it must ge pretty decent!
LouisB
All just an opinion of course
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