I'm new to this sight, so bear with me on this. I have, in my family, a Hopkins & Allen Mfg Co, double action revolver, which is nickle plated. Here is the information on the gun. Hopkins & Allen M'F'G' Co XL Bulldog .28 Cal Center Fire Pat March.28.71 Jan.5.86 5 Shot Octagon Barrel Serial # 3340 I can't find any information on this revolver. I didn't know there was a .28 caliber available. Could this be a mistake. The caliber digits are missing the nickle plating and I had to use a magnifying glass to see what they were. I thought it was a .38 cal until I looked at it real close, but a .28 caliber??? Is there anyone who can give me any insight on this revolver?