NOT that I am considering on using this (I certainly wouldn't risk a 137 year old rifle), but how old is "old" when it comes to black powder?
This unopened can came with the .45-70 rifle I purchased over 2 years ago.
I opened it today.
Smelled good, no overbearing ammonia smell. Grains are consistent.
Who knows what temps it's been in over the decades.
Good fertilizer I am told. Or keep it, and put it in the SHTF pile of stuff?