The National Match sight that wasn't quite ready for the 1918 National Matches:
http://img.photobucket.com/albums/v7...7backsight.jpg
http://img.photobucket.com/albums/v7...atchsight2.jpg
http://img.photobucket.com/albums/v7...atchsight1.jpg
I had a hard time getting this one to shoot acceptably with .308 jacketed bullets until I reread the entry in Hatcher's Notebook about the bore/groove dimensions. This is about the best it would do with .308 bullets (this is a darn good lot of GI Match):
http://img.photobucket.com/albums/v7.../M1917_M72.jpg
When I switched to the Hornady 174 grain FMJBT ".303 bullet", which mikes .3105 (laughably too small for any .303 Brit I have ever fired, but perfect for the 5-groove M1917), instant success. This was fired at 100 yards prone, using the "National Match" rear sight, 42 grains of "new" surplus 4895, which is considerably quicker than any 4895 I ever got from the DCM, or the DuPont cannister 4895:
http://img.photobucket.com/albums/v7...1917_group.jpg
I don't consider three rounds a "group", but I will shoot "triangles" when I am working up a table of elevations for military sights, which is what I was doing when I fired this:
http://img.photobucket.com/albums/v7...14299_4350.jpg
Resp'y,
Bob S.