sorry guys, been away for a while. ok, the super sonic shots were made at 400 psi, with both extra light darts that weigh in at about 8 grams and wax bullets that weigh around 4 grams. the barrel is around 3 feet long, with a very high volume chamber to increase the "f-d curve" (borrowed from wooden bow design) in other words, the force applied to the projectile(bow string/air) should start off slowly and speed up, rather than the other way around, this is of course impossible with airguns(although it is possible a ball valve could do this to some extent) but you can come as close as possible. the reason for this is, if the bowstring starts to slow near the end of the shot it will cause undue friction and slow the projectile down. also, a steel .50 bearing in a patch goes about 600 feet per second at the same pressure, instead of my calculated 1,141 fps, although it remains far more deadly than a dart, because it seems to have the same penetration onto a block of oil clay at room temperature, about 3-5x denser than you(excluding bones), around 7 inches.
the average speed of sound around 1,125 fps, and i seem to remember my fingers freezing on those days, which would mean it could be a little bit easier to break. also, it makes a *very*different noise than on 300 psi, and with a heavier projectile the gas escape noise is greater, but it doesn't make that very distinguishable whip cracking sound(yes, i am extremely familiar with bull whips/using/cracking/what they sound like), i hope this answers everyone's questions. also, to go supersonic with 110 psi, i would imagine one would need a projectile weighing less than a gram, a massive chamber, and around 7 feet of barrel. although, this is a guess, not an educated one, if you really want to know, you can figure it out. or build it and see.
