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 March 17, 2012, 10:49 PM #1 deerslayer303 Senior Member   Join Date: January 10, 2011 Location: Leesville SC Posts: 2,493 By Volume vs By Weight Ok, I'm sorry if this has been beaten to death but I'm curious. I was playing in the reloading room today. I got out my flask w/30gr spout and measure set at 30 grs. Now when I dump powder from the 30gr spout and from the measure on the scale I get 20.3grs +- with FFg and 21grs +- with FFFg. Does this sound right. The reason I'm asking is I am playing around with some deer antler That I have and I'm trying to make a 90grs by volume measure with it. So do I convert the by volume to by weight and ream out the antler accordingly or just go with the by volume brass measure an get the 90grs in the antler that way. I want the antler to be as accurate as possible. Or am I thinking WAY to deep on this one?? Last edited by deerslayer303; March 17, 2012 at 11:49 PM.
 March 17, 2012, 10:54 PM #2 Hawg Senior Member   Join Date: September 8, 2007 Location: Mississippi Posts: 14,498 30 grains of real black ought to be the same weighed or measured. None of the subs will.
 March 17, 2012, 11:44 PM #3 varmiter Member   Join Date: December 2, 2011 Posts: 24 Sorry Hawg, The OP doesn’t make sense apart from the fact that from a horn/spout the variations experienced are expected. I could understand the question if there was a bigger difference, which there would be say, between 2F and 3f. Several things need to be considered. BP us USUALLY measured by volume. It stands to reason that you can get more 3f powder into a given volume than 2f when both are measured by volume. But the 3f weight will be greater. While the above is in theory, but also in reality, is true, one ultimately comes upon the paradox of ‘diminishing returns’. The bottom line is that one achieves the performance desired for the granulation size of the powder. A change in the ‘f’ number will effect performance. An increase of compression, whether more or less, will effect performance. I can certainly understand how one can ASSUME that BP whether measured by weight or volume would be the same, but that is not the case. Chris
 March 17, 2012, 11:52 PM #4 deerslayer303 Senior Member   Join Date: January 10, 2011 Location: Leesville SC Posts: 2,493 Sorry I made a mistake in the post. The first one I measured was pyrodex FFg and then Pyrodex FFFg. This antler will be a 90gr rifle measure, So I need to not even worry about the FFFg. I was just curious about the weight. But I'm going to keep hollowing this antler out till I can get the 90grs from the brass measure in there.
 March 18, 2012, 01:18 AM #5 varmiter Member   Join Date: December 2, 2011 Posts: 24 Deersylayer303, Not to worry about the OP. Totally understandable. Depending on your own personal requirements just consider the following. Then go for it. The ‘F’ rating is only an indication of the size of the granule. This in itself if a rather large variable. So an ‘F’ rating between one manufacturer and another may well be different. The amount of compression exerted upon a specific ‘F’ rating from the same manufacturer will also effect performance. Since we are in the BP arena instead of the smokeless, a whole set of variables need to be considered if one wants the ultimate in performance. I could go on for pages and pages, but hopefully you get the idea. Chris
 March 18, 2012, 01:44 AM #6 HiBC Senior Member   Join Date: November 13, 2006 Posts: 5,467 Seems like you are muzzleloading.In Black Powder Cartridge (or anytime using Black) it is critical that there is no air space in the load.Regardless of weight,we want to fill the volume. Muzzle loader,you just seat the ball on top of the powder. Where I found my optimum max load was by paying attention to how many shot I could fire without having to swab my bore..just using a lubed patch. Its like finding rich vs lean in a gas engine. Too much powder,and after 3 or 4 shots you really have a hard time with the last 6 in of ramming. Back off a little,and you will be able to shoot 10 or so without swabbing. That is with Black.I never tried the substitutes
March 18, 2012, 02:28 AM   #7
arcticap
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Join Date: March 15, 2005
Location: Central Connecticut
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Quote:
 Originally Posted by deerslayer303 I got out my flask w/30gr spout and measure set at 30 grs. Now when I dump powder from the 30gr spout and from the measure on the scale I get 20.3grs +- with FFg and 21grs +- with FFFg. Does this sound right.
I initially thought that you were using Pyrodex and that's exactly the right weight for that volume according to conversion chart #1 linked below. It shows that 30 grains of Goex ffg equals 20.5 grains of Pyrodex RS by weight.

http://www.curtrich.com/BPConversionSheet.htm

 March 18, 2012, 02:28 AM #8 varmiter Member   Join Date: December 2, 2011 Posts: 24 You are right. Airspace is what the issue is here. But we are not talking about air space between the powder and the bullet. We are talking about the airspace between the individual granules of the powder themselves and effects compression of a particular granular size has on the desired effect. Chris
 March 18, 2012, 03:25 AM #9 deerslayer303 Senior Member   Join Date: January 10, 2011 Location: Leesville SC Posts: 2,493 Thank you Articap for posting the link to that chart, its saved in my favorites and printed out. Good stuff
 March 18, 2012, 05:40 AM #10 darkgael Senior Member   Join Date: February 9, 2006 Location: Homes in Brooklyn, NY and in Pennsylvania. Posts: 4,921 and? Another factor to be considered (or not) is that the volume/weight relationship - even in powders of the same granulation - may well change with manufacturer. A given volume of Swiss FFg will often weigh more than the same volume of Goex FFg, as much as 10% more. Y'know....we read so often about "you don't measure BP charges by weight; you measure by volume." or some such that one easily gets the impression that something bad will happen if you weigh charges. Of course, nothing bad will happen, though it is difficult to do in the field with a muzzleloader (unless one brings prepared loads). When I am shooting my BP target pistol, I am using weighed charges every time. When I drop powder into 45-70 cases, the measure has been calibrated with a scale. Another idea that may well be a myth is the "no airspace allowed". Makes sense in muzzleloaders.....but in cartridges? Aside from a negative effect on consistent velocity, why should airspace be any more of an issue with BP than with smokeless? Just askin', not arguin'. Pete __________________ “Auto racing, bull fighting, and mountain climbing are the only real sports ... all others are games.” Ernest Hemingway ... NRA Life Member
 March 18, 2012, 06:45 AM #11 Jim Watson Senior Member   Join Date: October 25, 2001 Location: Alabama Posts: 14,367 The chart provided by arcticap is handy and shows that the fake powders are less dense than real black. A given load of black is to be substituted with the same volume of Pyrodex, etc., not the same weight. The concern with airspace over a black powder load is the risk that the burning powder mass will hit the base of the bullet like an obstruction and ring-bulge the barrel. I have always wondered why the Scheutzen shooters don't ring barrels with their breech seated bullets and wadded powder only cartridges behind them. The answer seems to be that they do, just that the ring is where it does not affect accuracy of the breech seated bullet or extraction of the brass. Not every time, but in some cases. I also wonder about the Swiss Federal .41 and its Wild System ramrod with shoulder to stop the bullet about .10" over the standard powder charge. I don't guess a ring would be noticed there, either.
March 18, 2012, 10:28 AM   #12
Pahoo
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Join Date: February 16, 2006
Location: IOWA
Posts: 7,070
I load and shoot for "Fun"

Quote:
 I am playing around with some deer antler
I see you are really getting into this Buckskinner stuff and that's great. I have made mine out of antler as well but lately I make them out of horn as they are easier to work with. I go by volume with the use of a calibrated powder measure that has a cut-off spout on top. I've see some M/L guys tap their measures down and top off, before pouring and not sure what this does, especially when they would pour into another measure. ....

Might make a minor suggestion; If you like that 90grns. as your max, thats fine and I put a brass cross pin at a 70grns lower level. I then scribe my lower level on the outside of the horn tip. ....

Keep in mind that a RPB is very forgiving and a few grains off, either way, makes little difference. ...

Be Safe !!!
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 March 27, 2012, 10:47 AM #14 Rifleman1776 Senior Member   Join Date: April 25, 2010 Location: Arkansas Posts: 3,309 May have been answered, I didn't read all the posts. The volume measure for Pyrodex is an equvilant for black powder by weight. While measures do vary they are close. Don't mess with actual weight as you could overload. Stick with the measure. I make a lot of measures from antler, wood, etc. Try to use a drill bit about the same diameter as on your brass measure and drill to same depth. If you get more than you want, a little wax dribbled into the bottom will reduce the volume to where you want it.
 March 28, 2012, 06:30 AM #15 B.L.E. Senior Member   Join Date: December 20, 2008 Location: Somewhere on the Southern shore of Lake Travis, TX Posts: 2,496 If you use Pyrodex or anything other than black powder and you are drilling out a deer antler for a powder measure, just remember that you will have to calibrate that powder measure by weighing the charges of black powder that that measure throws, not Pyrodex. You can also weigh the amount of water that the measure holds, water's density is very close to the density of black powder. If you want 30 grains, you can also pick up an empty .223 case and use it as a powder measure.

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