I was just looking at a picture of an ULTRA and a Leshiy and some Weirauchs, and between them they appear to have barrels ranging from 11 inches to over 20 inches in length, and I got to wondering, Is their an OPTIMUM barrel length for 12 ft pound air rifles in .177 and .22 calibres? . I'm told by wiser people than myself that some airguns barrels are long to make them easier to cock (Break Barrels and UL's) and barrels dont need to be very long to obtain maximum velocity / energy?? .

So is there an optimum barrel length for 12 ft pound .22 and .177 air rifles??