Hi,
I think some of you would be interested in this uncommon information, so I want to share it with you.
For some time my friend Saverio Bonazza manufacture a solid nitro charge for his underhammer rifle. This charge was almost pure nitrocellulose and he developed a way to use it in a .50 rifle.
It was easy to load, it have almost no residue and develop less pressure than black powder according to his experiments (he made a pressure gun with crushers).
Unfortunately my friend left us two years ago and his grand son do not have experience to continue making the solid charge.

Thanks
Martin