I weigh all of my BH loads and put them into small vials for use at the range. However, there seems to be a group of BH shooters who feel that a load that is carefully measured by volume will produce more consistent results.
I normally use 120gr Volume of BH behind a 250gr or 290gr TMZ bullet. Both have produced 1 moa (@ 200yds-250yds, & occasionally 300yds) when fired from my T/C Encore 209x50.
My bore is rough and swabbing between shots is mandatory. Without swabbing, a third round is nearly impossible to seat on the powder.