I came so several conclusions about black "in an emergency". Its been successfully used in different 45 auto guns among others. If its a necessity for some reason to use black in otherwise unsuited cartridges, just do it. I'm not losing any sleep or brain power thinking about the likelihood of it. If you have primers to light off your black powder loads, why not just buy another can or two of decent smokeless powder to go along with it? That's my main conclusion on the using "black in an emergency" thoughts. After the first couple times I ran out of primers or powder, I never have come close to running out again. I've always bought ahead of my use, and didn't shoot unnecessarily if I didnt have supplies to stay ahead. In 45 Colt, I use 8 1/2 grs Unique. To get similar loads with black require 35-40 grains. NOT very cost efficient. I get WAY more loads per pound of smokeless than black, so stocking even a couple pounds of smokeless away would likely last the rest of my lifetime if things were as dire as not being able to get smokeless powder.