I always felt like measuring with volume (eye-balling a line in a volume container) was inconsistent. I weight every charge within 1/10 of a grain, just like handloading rifle rounds. This method has been consistent for me, and I make 5-10 powder charges at once when I'm measuring powder.

Surely measuring weight is better than getting it "close to a line" in a volume tube.

Side note--BH is easy to clean, and accuracy is better out to 200 with my ML compared with other ML powder. Pellets (like 777) would be easier to use, but it's harder to clean the barrel&plug.

From memory, I think I shoot 68.3 grains by weight BH under 250gr ShockWave. Its the most accurate combination I could find. Not the fastest, but very consistent in my ML.

With BH, make sure you use shotgun primers, not ordinary ML primers.