The Firearms Forum banner

Black Powder Loading: Confusion No. 1

1 reading
1.3K views 4 replies 4 participants last post by  soundguy  
#1 ·
Three week ago, a vintage-gun enthusiast let me shoot his black powder revolver at the range. Fascinating first time ever experience. I think I will eventually buy an Uberti 1851 Colt Navy 36 caliber (replica). Before I buy a gun, I like to learn about the gun and the shooting process. Please advise if I have the following information regarding powders correct. It was a bit confusing when initially explained to me (Thank you and sorry for a long post):

A black powder measuring tool for loading a black powder gun is actually a volumetric measure. Although the term of measurement is in “Grains” (as in cartridge reloading) the black powder device is measuring the volume of the powder but the calibration of the tool translates not in cubic units but in grains. This is important when measuring equal amounts of 'real black powder' and the black powder substitute Pyrodex. If 20Grains of 'real black powder' is measured with a black powder measuring device and then with that same device, 20 Grains of Pyrodex is measured for the load, both 20 Grains as measured are acceptable for use in an 1851 Colt Navy revolver chamber. However, it is important to note that the actual weight of the 20grain volume measure is more than 20 grains of weight for 'real black powder' but less than 20 grains of weight for Pyrodex. DO NOT USE STANDARD RELOADING SCALES TO MEASURE BLACK POWDER WHEN DETERMING GRAIN MEASUREMENTS FOR BLACK POWDER GUNS. I think this will be a fun departure from smokeless powder rifles and handguns.
 
#2 ·
Yes and no on the grains by weight, depending on the brand and granulation of the black powder the weight can be the same but it might not. Using a volumetric measure is faster and easier and small variations in charge weight doesn't affect accuracy like it would with a modern round using smokeless. Also, it's impossible to overload a black powder revolver. You can't get enough powder in a chamber to blow it up. If you get a brass framed revolver heavy loads will batter the recoil shield and make the gun loose. I like using lubed felt wads under the ball rather than grease over the balls as they are less messy and both lube the bore and prevent chain fire. You'll probably have a better gun with a Pietta. Uberti are sort of hit and miss and can need a lot of tuning to get them to run smooth. And the Pietta costs less.
IIRC, the volumetric measure at 20 grains holds 20 grains by weight of water.
 
#3 ·
What Griz said. You can weigh real black powder on a scale but the granulation and even the brand will make it off but not enough to matter. Pyrodex and other subs must be weighed by volume. My load for a .36 navy is 25 grains of 3F and a .375 ball with a lubed wad. FWIW original navy revolvers only came in .36 caliber. Pietta is the best bang for the buck. Uberti may look a little better and they don't have all the markings on the side of the barrel like Pietta does but they do tend to have issues like short arbors.
 
#4 ·
Just as a side note, back then the tern navy denoted caliber not branch of service. The US Navy's mill spec for revolvers was .36, the Army's spec for them was .44 so that's why 44s are army (cailber) revolvers. The 1851 Colt was never offered in the army caliber, only the navy caliber.