Actually, I'm shooting my Krag in the Roosevelt Match, my K-31 in Vintage, and my 1903A3 in the Springfield Match... all are As Issued.  Since I only have one 03A3, I would be altering the rifle and it would no longer be eligible for the Springfield Match, unless I alter it after the match.  The bottom line is I don't really want to have to change it, and I only own one.  So I may have to set the rear sight for a different elevation to be on point at 1000 yards, OR... find my point of aim for 1000 yards and treat it like Kentucky Windage (aim for a point above the bullseye).