I just made a gun with a 10 bullet magazine that shoot's 72.1784778 feet!!!!!!!!!!!!! with four rubberbands!!!!!! I think it can hold more but I haven't tried yet. What I wanted to know is how to make a good measurement system for proving range, I would appreciate if someone could tell me. (Also I told people my oodammo sniper shot 90 feet, this was a mistake, I thought a meter was 4.5 feet).

I will soon post a video proving the (unangled) range.
Edit: I will not post the video since there is so little interest