Yeah, that happens on all guns. It's way more noticeable on GBB, but still happens on piston/cylinder guns. In most AEG's the muzzle energy with varying BB weights is approximately linear with mass but like wind_comm said, the behaviour you are experiencing is coming from your cylinder having a larger volume than is required for your barrel.
Let me guess, 10.5" barrel and type 1 cylinder? Or 14.5" barrel and type 0 cylinder.
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