I know this thread is old but i have a further development for those interested,.......before I kick this off again I would like to say I have yet to test this as a cartridge!! I have nitrated these,... burnt them,... and formed rounds with them so don't spend a lot of time making 1K rounds before this is tested further........make 20 or so and shoot them before going further,.....This being said,............
I was doing some Top Secret work,.....No really,....and I thought about using coffee filters for combustables,.....I mean think about it,....it's lite almost woven paper that is supposed to get wet and still remain strong enough to move coffee grinds from the pot to the waste can.......
This means it has pockets to retain the saltpetre and is very sturdy to soak in solution, dry, and make cups for cartridges from........
Below I've posted three videos of some burn tests.....nothing special,....just more to think on....
[youtube]http://www.youtube.com/watch?v=mgb5znSE56c[/youtube]
[youtube]http://www.youtube.com/watch?v=-aGHdMwfVh4[/youtube]
[youtube]http://www.youtube.com/watch?v=ZGC4mJwlsuo[/youtube]