You need to be careful with the electronic powder scales. They can and do drift over time. Especially the battery powered ones. You need to double check them often.
I also use the volume measurements with black powder and subs. But I use weight in grains for smokeless powder.
But ages ago when I first started reloading as a teenager I used the Lee Loader sets that had powder dippers in them. I got quite good at using the dippers and even made a bunch of DIY different ones for different loads etc.
When I first got into muzzleloaders as a teenager I used the Dixie Gun Works catalogue as my reference. It is still a good source to use today too.There was no internet way back then. Everything was mail order or by telephone. But most people didn’t have even home telephones yet. The public and school libraries had next to nothing about muzzleloaders then either. Anyway the DGW catalogue used by volume measurements too.
When I think about it, the early settlers, trappers and hunters used volume measurements for their muzzleloaders too. I seriously doubt that any of them carried a balance scale so they could carefully measure out their powder charges by weight.