What are you gonna do with it? If you are going to use a 16" bbl for that round, such that a lot of the powder burns out in front of the muzzle, rather than behind the bullet, then I would venture a guess that you would greatly diminish the capability that makes the .204 cartridge desirable to begin with (high velocity), which would make it no more useful than a .223, which is easier to clean and a LOT cheaper to shoot. I could be wrong however. Anyone know the velocity loss from 20 to 16 or 22 to 16 with .204?
