Thanks guys. The 03-A3 is a "black barrel" hand-me-down from my dad. Pretty hard to make the condition of the bore any worse.

I am familiar with corrosive primer cleaning technique. I was more concerned about what had become of the powder's chemistry. My butt is not on fire to shoot up the stuff. I was more curious than anything. I will not shoot up the ones from the TC arsenal, for historical reasons.
Now, as to what to do with the full pound bottle of Lil Gun that I mistakenly put about 1 ounce of 2400 back into by mistake.

Hate to relegate it to the flower bed. It just sits in the powder drawer, boldly marked and glaring at me accusingly.
Thanks,
Hoot