Quote:
Originally Posted by pestobanana
Nothing is wrong. Using heavier ammo with the same propulsion system will always result in more kinetic energy. There will be more air pressure behind the projectile, and due to the slower acceleration of the air involved it will present a more efficient transition of energy to the projectile.
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Won't
always produce more.
If the inner barrel is extended enough that ~100% of the potential energy is transferred from the piston/Gas to the 0.2g BB then the heavier weight BBs will have a proportionally lower velocity (equal in joules).
Similarly, if you have a very short barrel (as in a pistol) heavier weight BBs will also be slower than 0.2g, although not proportionally as they do accelerate more slowly, thereby staying in the barrel longer and acquiring more energy, but still leaving the barrel very early.
There's also a difference in the power curve between piston (AEG, spring) and gas systems: pistons have inertia as they begin to move forward and generate power through the entire stroke (usually with a bias towards the first half, when the spring is more compressed; how much depending on the spring). Gas, OTOH, is released with maximum energy (sharp spike) which tapers off quickly as it expands. This also depends on how much gas is being released, what type/how pressurized it is, environmental factors (such as temperature), etc.