The mass of the tennis ball still provided a decent launch at 110 PSI, but pop cans don't do so well. Does anyone have a clue why it was quiet? If I'm interpreting the results from GGDT correctly, changing the mass of the projectile will also change its position within the barrel, at a given pressu...

This is an old thread, but has anyone figured out how this phenomenon of becoming silent works? Any ideas/thoughts/conclusions since this was initially posted? This is very interesting stuff.