First of all I would like to note that I don't live in the UK or USA, I live in The netherlands(yeh yeh I know windmills,gouda cheese,drugs,tulips).it went to a nice height and made a good report. That?s what they do in firework company's one bunker does the rocket mortars and the other does the shell and then it goes and gets all its designs done. Were do you liv in the UK or USA to get thoes chemicals for your fireworks.
You ask me where I get those chemicals, well they are pretty standard, kno3,sulfer and charcoal is not very hard to get.
I just made another vid. the rocket went straight up and had an even louder report
and a nice (allmost) symetricall break .
I know BP is not the best composition to break small shells but I find H3 to risky with sulfur containing stars.
By the way, I use granulated BP troughout the whole shell(no inner flash)and as you see it performs pretty good.