Apparently my grandfather gave my sister his mother's boot gun. 2nd H&R in two nights I have had my hands on. This one is a 5 shot revolver with no caliber markings. It is a break open. I have a 38 special case that fits in the cylinder just fine, though there is only 1/8" of space between the case mouth and the end of the cylinder. The barrel is 3-1/4". The upper part of the grip (on both sides) has a target with 5 shots on it. The serial number on it is D994**. The top of the barrel has the H&R stuff with a handful of patent dates--the first Oct 8/87 and the last April 7 1896. Any ideas?