Barrel markings
I have right here in front of me a unused surplus Victory model barrel for the non special cartridge and it says "38 S&W CTG" on the side, and a British commonwealth surplus example that I got from SOG says the same. I cannot read much else as the gun is very worn and covered over the very worn surface with flaking black British paint. Might say U.S. property somewhere, but this thing falls in the paperweight category right now. Maybe I should part it out! If it has "special" on the barrel, stamped in, at least the barrel is for that ctg. But to be sure, do the special cartridges fit easily and do the cases show any signs of unusual bulging? I would think that if a .357 diameter bullet is snug in the cylinder throat, that it would not be for the larger diameter older cartridge. A 38 special case will only go part way into a 38 S&W chamber, about 1/4" sticks out. A .357 bullet goes right thru the chamber throat, and can rattle around with plenty of play in the throat. The larger barrel does not cause a threat-it would lower velocity and pressures. The over sized chamber in the cyl. allows excessive case expansion and with modern +p loads might rupture the case to allow you to get hurt. The gunsmith can easily guage this.