I don't think they will fit in a 1.75" tube but I have dropped them into 2.5" mortars with no problems. And no, it really doesn't matter if the comet...
I've seen this video. There is a second video from a different angle as well which makes me wonder if wasn't staged. If it was a shell, I don't think...
Yeah, the time fuse would be your limiting factor. You might be able to get a little more height due to increased velocity, but it would probably be...