Talk:Automatic shotgun

Pattern size
I think you will find that the diameter of the muzzle bore of a shot gun affects the spread of the shot. The length of the barrel affects the the ultimate velocity of the shot. I.e. A short barrel may not allow all the powder to be burned (not contributing to the highest velocity) while a longer barrel may allow for more complete powder burning ( maxiimizing velocity). Spread of shot is also called the shot pattern. Shotguns barrels are usually classified in order of greatest pattern spread to smallest pattern spread: Cylinder bore (Skeet). No difference from chamber to muzzle. 0.00" Improved Cylinder. Slight restriction from chamber muzzle. 0.01" Modified 0.02" Modified Full 0.03" Full 0.04" 24.192.45.234 (talk) 02:43, 26 November 2021 (UTC)