Powder Volume to Weight
02-20-2017, 01:40 PM
#32
Boone & Crockett
Join Date: Mar 2007
Location: Comance county, OK
Posts: 11,408
Yesterday; using my TC measure i weighed ten measured 100 grain charges of Grafs 2F black powder. Average weight was 101.5 grains. Low was 100.9 grains and high was 102.1 grains.
Last edited by falcon; 02-20-2017 at 01:48 PM.
02-20-2017, 01:43 PM
#33
Banned
Join Date: Dec 2008
Location: Boncarbo,Colorado
Posts: 9,186
That's not bad Falcon. I have an old traditions which throws in weight 69. something odd grains of bh209. With 10 loads, average was 1.5 grain spread. Can't argue with that.
In all honesty, weighing loads I found to be a major waste of time. Its not smokeless powder where 2 grain can make a big difference.
In all honesty, weighing loads I found to be a major waste of time. Its not smokeless powder where 2 grain can make a big difference.
02-20-2017, 02:18 PM
#34
Boone & Crockett
Join Date: Apr 2007
Location: River Ridge, LA (Suburb of New Orleans)
Posts: 10,917
Do you have one of the U-Views? It would be interesting to see how it does with Grafs 2F. My bet is the 100 grain setting will throw something around 91 grain weight.
02-21-2017, 05:58 AM
#36
Giant Nontypical
Join Date: Nov 2005
Posts: 6,585
Hmmm...Imma have to go get some Goex now to test that theory Semi. Because one thing you said is a bit inaccurate. The formula for BH to Black powder weight equivalence is .7 correct? Now, if you are getting en equivalent throw of 70 grains weight from a 100 grain by volume, then aren't you getting a correct volume measurement? The only BP I have on hand is Swiss and that never measures correct by volume in an American measure. One of my boys may have some Goex but it is probably older than dirt. He hasn't pulled his sidelock smoke pole out in a while now other than for inspection and cleaning/oiling.
I am inclined to believe that the U-view was designed for the modern subs and +-1 grain is top notch for me.[ 69-71 Blackhorn]
I used Black for many years 4 or 5 different kinds with different grain sizes and different energy levels I much doubt there is a measure that will give reasonable accuracy with them all.
02-21-2017, 08:03 AM
#37
Boone & Crockett
Thread Starter
Join Date: Aug 2004
Location: Idaho
Posts: 11,703
One of the critical steps for a BP sub to be considered as a sub and sold as a sub is - that it meters +/- so many grains to the standard. So in reality some definitely have more energy than others when metered - the way they meter should be close to the set margin what ever that might be.
I once read that standard but now today - I can not remember where I found it!
I once read that standard but now today - I can not remember where I found it!
02-21-2017, 12:44 PM
#38
Giant Nontypical
Join Date: Nov 2005
Posts: 6,585
Mike I think I read that same standard and they said it was set with 3F of Black made by a company that blew up and went out of business in the 1960's.
Any way I am inclined to believe that the important thing is to know what your load is so a lost or broken measure doesn't put you back to trying to find the load that worked best. A scale would do this best.
Any way I am inclined to believe that the important thing is to know what your load is so a lost or broken measure doesn't put you back to trying to find the load that worked best. A scale would do this best.
02-21-2017, 01:07 PM
#39
Giant Nontypical
Join Date: Nov 2005
Posts: 6,585
This has made me want some answers so I went through some very old black powder books I have and the internet.
In my search I also found this:
Oh, I also justread that possibly one volumetric grain of BP is = to a 1 grain of water byvolume. So if you filled up a 60 Vgr BP measure with water, the water wouldweight 60 grains on a scale. I will have to go check this to see if it iscorrect. If so it would be easy enough to calculate volume of a measure. I haveno idea if this is true or not.
To check this
The weight ofwater equals 62.4 lbs for a cubic foot. This works out to 998.4 ounces.
We can take the weight and divide it by the cubic inches (1728 cubic inches ina cubic foot) to find what a cubic inch weighs.
So 1 cubic inch of water weighs .5777777778 ounces
1 ounce = 437.5 grains. Thus 1 cubic inch of water weighs 252.7777778 grains(.5777777778 ounces * 437.5)
volume = Pi * radius2 * length
So lets put this into action.
If we have a cylinder that is .39" in diameter and 2" long first wefind the volume.
V=3.14*.195(sq)*2 = .238797 cubic inches
So .238797 cubic inches * weight of one cubic inch in grains(252.7777778) =60.36grains of water by weight.
I checked this with a powder measure and it works out to be within a grain ortwo of the math.
There you have it. A black powder volumetric measure is based on the weight ofwater.
So one volumetric grain is = to one grain of water.
Greebe
In my search I also found this:
Oh, I also justread that possibly one volumetric grain of BP is = to a 1 grain of water byvolume. So if you filled up a 60 Vgr BP measure with water, the water wouldweight 60 grains on a scale. I will have to go check this to see if it iscorrect. If so it would be easy enough to calculate volume of a measure. I haveno idea if this is true or not.
To check this
The weight ofwater equals 62.4 lbs for a cubic foot. This works out to 998.4 ounces.
We can take the weight and divide it by the cubic inches (1728 cubic inches ina cubic foot) to find what a cubic inch weighs.
So 1 cubic inch of water weighs .5777777778 ounces
1 ounce = 437.5 grains. Thus 1 cubic inch of water weighs 252.7777778 grains(.5777777778 ounces * 437.5)
volume = Pi * radius2 * length
So lets put this into action.
If we have a cylinder that is .39" in diameter and 2" long first wefind the volume.
V=3.14*.195(sq)*2 = .238797 cubic inches
So .238797 cubic inches * weight of one cubic inch in grains(252.7777778) =60.36grains of water by weight.
I checked this with a powder measure and it works out to be within a grain ortwo of the math.
There you have it. A black powder volumetric measure is based on the weight ofwater.
So one volumetric grain is = to one grain of water.
Greebe
02-21-2017, 01:19 PM
#40
Boone & Crockett
Join Date: Apr 2007
Location: River Ridge, LA (Suburb of New Orleans)
Posts: 10,917
Well that's interesting. It turns out that the rubber O-Ring on the TC U-View measure makes it watertight. I just ran a test.
With the measure set at 100 grains I weighed three water charges. They came out 97.9, 97.6 and 97.7. The water left on the inside wall of the measure would likely bring those numbers up very close to 100.
With the measure set at 100 grains I weighed three water charges. They came out 97.9, 97.6 and 97.7. The water left on the inside wall of the measure would likely bring those numbers up very close to 100.