Quote Originally Posted by bill57 View Post
It's the popgun effect. The pellet has to be tight enough to hold on till a point of maximum compression, then away it goes. If it's loose it goes too early, before that point has been reached, so you haven't got maximum efficiency from the system.

I'm sure someone will explain it much better than me.
Nope, that's it. Loosey poopy, tighty righty! Or something.....