LAST EDITED ON Sep-11-14 AT 09:35PM (MST)[p]LAST EDITED ON Sep-11-14 AT 09:32?PM (MST)
Measure 10 loads with your volumetric Powder loader. Weigh and record the weight of each load. Once you have 10 loads recorded, add all of them together and divide the answer by 10. The answer should be your average throw weight in grains, for 100 grains of black powder Volumetric loads
Then you can weigh all your charges if you want and put them in your speed loaders. You would have no variations in your loads and they will all be within the 100 grain volume you are looking for.
If you want a more precise way of doing it call the manufacturer of the powder you use and ask them how many grains by weight of their powder is equal to 100 grains by volume of their powder.
Make sure you are clear on this, if not post back.
In the field use the same volumetric accessory that you used to throw your weighed loads. You will be close but you cannot be as accurate as weighing your loads. Some people think you get more accuracy by weighing your charges. I use to do it but I compared my group to 3 shots weighted in grains and 3 shots thrown by volume. My group was not off enough for me to weigh my charges. Of course I don't shoot the same loads now so my findings now might be different.
If you really want to test your loads, weigh 3 loads, and throw 3 loads by volume. Then shoot each group and see what your outcome is. The truth is in the pudding.
If you do the test, post back and let us know what the outcome was.