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Can any one tell me the factory tune to .22 and .25 please? .22 600mm and .25 700mm barrels. Any help will do.

Hello. As much as I raise the reg. pressure and the hammer spring it doesn't increase the pellet speed. I'm on 670fps max jsb 18gr. So my question is: It is the gun mechanically limited? what should I do to achieve full factory power? Thanks