I have been using my M1907 for a couple years now and have always used it in the standard configuration however I read a book lately by Jim Owens called The Leather Sling and Shooting Positions. In the book he mentioned another configuration that was used by the USMC rifle team where the frogs are facing the stock and both keepers are below the top frog, supposedly it's slightly more difficult to assume but is more secure, does anyone have any experience using the method described by J. Owens?