Whenever I measure a shotgun with "no choke at all" I try to see if barrels have been cut. Not saying they are, but I always try to check for signs of it. I have two Damascus shotguns an Ithaca and a Dan Lefever, both are choked. Ithaca mod/full and lefever ic/ic. Both are American of course. Also, most American makers used "standard" barrel lengths. So if no choke and barrel is 27" I "assume" probably was 28 or 30" and cut down. Foreign shotguns are sometimes found in odd lengths though.
