A talented contributor on this forum, 'DanL', posted some fascinating stuff on this theme way back in the dim distant past: 2011, to be more exact. Here's a link to the thread:Roboticus_Prime wrote:I've seen a video of a guy the put black powder charges in his King Tiger. It had a really neat effect. I can't find the video anymore though...
viewtopic.php?f=21&t=6830 There are also a brace of links to Youtube for the black powder experiments you referred to... One you'll find below.. It's a fascinating thread. Amazing what you can unearth when you dig somewhere
..sort of rctank 'time team' archaeology..Pity Dan's not been seen here lately, along with 'Saxondog' from the same thread. Time and tide, eh? Oh well 
He'd also developed some ingenious modifications to his KT that should still be relevant and interesting today.
Here's a pic of his gunpowder igniter for the King Tiger barrel: