from what I am seeing would it be allowed/possible to shoot with a pneumatic piston and and with 2 cargo in the chamber and make one in to the upper and lower goal at the same time?
Is there anything in the rules that would make that illegal?
As far as I can tell shooting two at once is fine, there also doesn’t appear to be distance restrictions on shooting like 2020
You will want to do some extensive testing of different ways of executing this idea before committing to starting a detailed design. It would also be a good idea to do some research to see how other teams may have done this in the past.