Hello from the UK!
Thanks to all the contributors to this forum, past and present, for the goldmine of information.
I am making BP for lift and burst sifting each component of a 75:15:10 composition with 100 mesh. I do this three times, mixing in a closed plastic box between sifting. I add 2.5% dextrin, 25/75 isopropyl alcohol/water and grate through 10 mesh. Once dry I separate what passes10 mesh but not 20 mesh (4FA equivalent?) as my BP. The charcoal I use is good quality willow.
The result is good, but not very hot.
I'm curious to know if there is anything more I can do to improve this BP, or is the next step a ball mill?