is their any way to make a mag more efficient?

[hitech]

Blowback...

Reduce blowback and you will reduce the air necessary to propel the paintball.

You also need a barrel matched to both the paint you are shooting and to the gun (long enough to accelerate the paintball to the desired velocity and no longer).

The barrel should not be ported and be as "friction free" as possible.

[rudy]

also

say just for an example the bolt spring pushes back with 50 psi then if you have a mag running at 400psi and and the bolt starts to return at 50 psi you seeblowback then. at 12.5% of psi now if your gun operates at 600 psi and it returns at 50psi then you see blowback at 8.3% of psi also the larger chamber size falls in. I dunno that isnt exactly how it should be worked out mathamatically but it gives an idea a place to start. maybe a lighter bolt spring would show some increase in effeciency probbaly at the cost of speed on the return.