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Here are the barrel bore diameters.

.224

.308

.5

.77

The barrels are usually rifles and some projectiles are full size (size of bore) while others use sabot's where a .224 or .308 can be shot from the larger bores of .5 or .77 using a plastic adapter.

"bullet" or pellet weight can range from 20 grains up to 900 grains over the 4 bores.

There are also arrows or bolts that can be fired using something like a sabot to make a seal around the shaft and the arrows weigh about 150-300 grains.

The pressure in these guns usually run from 2500-3000psi when fully charged but there are some that can reach 5000 with special equipment (and being built for such pressure). I'm trying to figure out what the calculations would be to determine the energy being put behind a projectile using these PSI ratings as well as how much energy might be in the projectile itself (how many joules or ft/lbs and maybe how fast it could be expected to travel).

Expect the barrels to run from 16-28 " and can be made for ideal power.

Can anyone help me in figuring out where to start for this?