I inerted a 7.5 Swiss revolver round at SLICS so that it could be shipped back to the UK and I am pretty sure it contained black powder. Why was there a need for a black powder load in 1960? My example is headstamped “5 D T 60”. However, the inside of the case may just be badly corroded and appeard to have held BP, I will check again tomorrow.
Thanks for any info.