Quote Originally Posted by simesgee View Post
It is more efficient to accelerate a large mass by a bit, than to accelerate a small mass by a lot. That is why passenger aircraft engines have this big fan on the front - to suck in a great mass of air and accelerate it a relatively small amount.

As a .22 is greater in mass but leaves with a lower velocity than a .177 the air is used more efficiently.
Hope that helps!
Simes.
Clever clogs - - so the Beeman in .177 must be way down then. What a pointless rifle then.