Planning on a 22" 6.5 Creedmoor with a Heavy Varmint contour and JEC Brake. I'm not familiar with the 6.5 but I noticed that most rifles are 24'" or longer. Does the cartridge like a longer barrel? I'd like this rifle to reach out where my 308 can't (+800 yards). So by going 22", should I consider the loss of velocity, assuming that I'd like to shoot a 140gr bullet? So I guess I'm trying to compare a 22" vs. 24" or 26". Seems like a good topic because some guy like to go with shorter barrels. Or am I over thinking 2 inches?