Joe & Gary, thanks a lot for the info. The hole spacing on my barrel I measured originally as 0.560" and on the tang at 0.900". After remeasuring the tang holes, I can convince myself that they are actually spaced at 0.860". So, it looks as if the rifle has standard spacing for scope blocks. Marks left on the tang are 0.425" apart, so that is the width of the blocks - at least the part that contacts the tang. I've looked at Steve Earle's site. I don't have any sophisticated measuring tools, so I need to figure out some way to determine what the height of the front and rear blocks should be. I'm not certain I want to spend the money for one of those scopes, but it might be worthwhile to mount the blocks on the rifle.
