This isn't evidence for your claim as no wadcutter was mentioned. Furthermore, in case you haven't figured it out your stance suggests that an automatic was used, but your beloved WC never said that LHO ever used an automatic pistol.
You put yourself in a no-win situation. Hurry up as lifeboats are filling up. 🚣
A wadcutter is simply a kind of bullet. A .38 special wadcutter is still a .38 special, and is still fired from a .38 special cartridge case. Claiming that a .38 special wadcutter isn't really a .38 special is like saying a .38 special FMJ round isn't a .38 special, which is stupid where it's not ignorant.
Hill only had empty cases ("shells"); he wouldn't have known what kind of bullet had been fired from them. Wadcutter cases generally don't have any distinctive marks on them to easily differentiate them from other types of .38 special rounds. I wouldn't be surprised if some manufacturers had a particular code letter(s) to distinguish different bullets within a caliber, but I doubt Hill would know all (or maybe even any) manufacturer's special codes. There might even be someone who actually puts something fairly easy to decipher, like "WAD," on the case, but it's definitely not common practice. I'll even throw in images of wadcutters, showing what's engraved on the base. Note that I've included examples from Remington, Winchester, and Federal, the big three among US ammunition manufacturers.





