There is data in at least one modern reloading book as to the additional velocity per extra inch of barrel length...maybe even broken down by bore. It did not give the point of diminishing returns though (EG .22lr in general gives less velocity in barrels longer than 16" to 18" depending on the ammo and less velocity below that length. The burn rate/quantity of the powder had something to do with as well i think?



Ms. Raven