I have just emailed a few more photos of this gun to Ted who kindly offered to put them on the board for me. I measured the barrel length and it is 76 cm which is 30" so perhaps the 76 stamped on the underside refers to that rather than the chamber length although it does say " CAM 76 ). I don't have any 3" ammunition but a spent 3 1/2 " casing with the crimp folded back in almost fits in the chamber. There is about 1/2 " that still sticks out when the casing bottoms out in the chamber. I sure do appreciate all the help you are all providing me on this. Cheers; Twogone

Some folks use statistics like a drunkard uses a lamp post; for support rather than illumination.