The exception is the .410 shotgun (pronounced "four ten"), which is actually the bore diameter expressed in hundredths of an inch, in a manner similar to handgun and rifle calibers. A "choke" is a tapered constriction of the bore of a shotgun barrel at the muzzle end.
Ballistic Trajectory with Bear Creek Ammunition 240 HV bullet (2,590 fps): +2″at 100 yards; 0″ at 200 yards; -14” of drop at 300 yards, ammunition will retain 1,000 ft-lbs of energy at 400 yards. Weight – 8 to 10 lbs. depending on options and barrel length. Custom Options Upon Request