Shot my Krag sporter in a vintage "fun" match Saturday (my birthday) and we had a ball.  We placed 4th with a 482 but were clean on slow prone.  Those Redfield no-drill sights are nice.  The match organizer jokingly told me if I used my speedloaders I'd have to compete in the "modern" category with the ARs.  We beat a lot of them anyway.  I've been loading a little 125 grain flat base spitzer for a while with good results but need to come up with a longer round as it jams frequently.  Maybe I'll break out some of those "real" 30-40 cases I'm hoarding.  They will be a little longer than my 303 cases.