Originally Posted by
Muley Hunter
From the BH 209 site.
We always recommend that you start with a fresh powder charge every day. Although Blackhorn 209 is far less hygroscopic than any other black powder substitutes, barrel “sweating” can put moisture directly in contact with the powder and may affect powder performance. Why take the chance of missing the next mornings great shot?
Hell yeah they do, you use more powder, therefore buying more.