Blackhorn 209 is a bulk smokeless powder - great stuff for 209 primer ignition guns.
Blackhorn 209 is not smokeless, it is a blackpowder substitute
and has to be measured by volume
and not weight
like smokless powder. Use a regular 209 primer with this powder and not one of the reduced ML primers designed to decrease fouling in in-lines. It has a higher ignition temperature but is a very good choice.