since BP is all that is used in large artillery and naval guns I believe they switched to nitrocellulose well before WW-II. The priming charge was still BP, I think. Some landmines continue (?) to use BP to propel the mine out of the soil before detonating. My word, regarding the US Artillery, you ...

Regarding Elephant and fouling - I have an old can of 2F Elephant from the infamous "bad lot" of over 6 or 8 years ago. It fouls so badly it plugs the breech of my 12 ga percussion fowler in one shot. This was seemingly a QA problem, exacerbated by certain humidity conditions (I think exce...