It's a logical question that we all seem to come toas we get into this BP arena...but as Kevin said, there's really is no benefit to it...and it's results would not be as precise as with smokeless powder anyway.

The biggest single reason that it's not beneficial to weigh blackpowder (& BP subs) is that they are lessefficient thansmokeless powders to begin with.
ie: a few 10th's of onegrain of some smokeless powders can be significant, however with black powder, it usually takesseveral grains one way or anotherto actually notice any difference at the target...if I poured/ measured a dozen 100grn charges,and in realitythey varied plus or minus 3-4 whole grains from that, I'd never be able to tell it at the target.

And there's another reason not to weight BP charges...you've already gone through the centerfire reloading experiences, reloading, weighing charges precisely, etc, etc...traditional muzzleloading is not about any of that anyway and I assume your interest in getting into traditional muzzleloading is to experience "how they did it back then"...sowe really DON'T want to drag modern instruments into the picture...weDON'T want to try and fast forwardthe traditional blackpowder era up into the 21st century...we WANT to do it like they did it a couple hundred years ago...otherwise...why bother doing it at all...we could just stick with the 7mm magnums and weighing charges to 1/10th of a grain, etc.

Andyou'll be shocked at how accurate, and consistent, your shots will be just measuringpowder by volume...most anybody can shoot impressivebullseyes with modern rifles and big enough scopes, but shooting a single ragged hole at 50yds with apatched lead ball is very impressiveconsidering the technology and variables.

Then...when the day comes that you lay your muzzleloader down across your lap, white smoke drifting off through the trees, a nice buck laying in the leaves 50 yds out front...then you'll know real satisfaction and accomplishment...and will be glad you did it the old fashioned way...