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Discussion Starter · #1 ·
I recently modified an air cocking sniper rifle. Usually I'm used to messing around with AEG's and there the rule of thumb is that the heavier the ammo, the the lower the FPS. With the sniper rifle, it's the exact opposite.

with .20 gram BB's we got a speed of around 500 FPS. With heavier BB's this increased up to 605 FPS with .32 BB's. Those were the heaviest BB's we had laying around.

Now I'm pondering why this is. The only theory is that the piston produces so much pressure that it is able to propel even the heaviest weight BB up to its maximum velocity. Heavier projectiles have a higher theoretical maximum velocity with enough pushing power.

Is this a correct assumption or does anyone have any other suggestions why the speed of the gun increases with heavier ammo?
 
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