Powder and consistency of measured charges

[bezoar]

Is there any way to know that my 60 grain measure from traditions will be throwing the same volume of powder as someone else?
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My measure is 3/16 diameter and 2 inches long and can throw 60 grains maximum. This would give it an internal volume of .0552 cubic inches using radius squared * pi, and that * 2 inches.

the following load .735" ball dipped in a mixture of deer tallow and bees wax and 90 grs. of 1F can be found at http://www.svartkrutt.net/engladebess.php

from the pictures, his powder charge apears to be 2 balls long, 1.47 inches long, and .735 in diameter. which would make a volume of .4243 cubic inches. that would come out to about a vvolume of .0047 cubic inches per grain.

but my measurer comes out to a volume of .00092 per grain. that would create a volume of .0828 for 90 grains, a difference of .3415 in total charge volume or 371 grains with my measurer.
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My math may not be 100% accurate, but is my thinking that the charge will not be the same unless an identical powder measurer is used? Or am I comparing the volume of a measurer designed for 3F to a measurer designed for 1F?

 

[NORD]

No, from my experiences with my two powder measurers they do not measure exactly the same...but they are close enough for blackpowder. When target shooting I use the same powder measurer I started the match with.

:m2c:

 

[jim gray]

Is there any way to know that my 60 grain measure from traditions will be throwing the same volume of powder as someone else?

Do you have any way to weigh the powder from both measures?

 

[Stumpkiller]

Get yourself a reloading scale. I have one calibrated measure that is 25% high when I measure the charge on my RCBS 5-10 scale. That's enough of an error in the direction to cause a scary overload.

 

[biliff]

To find out if your measures have identical internal volumes fill 'em up with water and then weigh the water. Since water doesn't compress you don't get the settling variations inherent with weighing powder. Course this assumes you can seal one end of the measures adequately enough to retain the water.

 

[TANSTAAFL]

Uh, I got lost in the intricacies.

For BP starting loads, I just throw it in on the reloading scale and weigh it out, then work up or down from there for accuracy/power. For final load to be used, I make a measure which by volume equates to the desired weighed charge.