Bb gun psi question?

Question

ok i have a daisy 901 bb gun and i t shoots around 750 fps but i am making a bb gun also and i would like to know how much psi it uses so if i know how much psi to fill my bb gun to to be as good or even better than a store bought one

Answer 1

Seems they use 852.8 PSI in standard CO2 cartridges. that might be a good start point. Depending on what kind of seal is on the gun it might take higher pressures.

You will have to use trial and error, to much PSI may give poor accuracy or pop the seals. better to start low.