Buffdog, thanks much. I have studied your bolt assembly information before and have read the posts on neck sizing for large chambers. This forum is great. It renewed my interest in the Ross rifle. I have owned this one for over 35 years. I cannot remember if I fired it or not. The mystery deepens somewhat. Hopefully I will download a picture of the left side of the barrel with serial number and ," MADE in CANADA" stamping. The barrel is a good deal slimmer than that of the military 1910, with a smaller front sight mount, without screw holes for a sight guard. The barrel is 26 in. bolt face to muzzle as opposed to 30 1/2 . The barrel diameter just forward of the sight mount is .580 compared to .653 for the military M1910. " 04" is stamped upside-down inside the toe of the butt plate( last two of serial number). I surmise this is a 1910 R with an , "LC" stamp ?????