EricD,

I have a M03 in .300WM as well (the fluted match barrel). With handloads, you can in deed get benchrest gun accuracy. Got best results with 168 grain Berger VLD bullets at 2995 f/s (H 4813 with RWS Magnum Primers -nice practice load) and 210 grain Berger VLD bullets also at 2995 f/s (Norma MRP-2 with Fed 215 primer - very hard-hitting hunting load). Both loads shoot hole-in-hole at 100 meters. Brass was Lapua, which is the only brass that I would use for the 210 grain load at that speed, as it has a case volume approaching a .300 Whetherby (although Norma cases have a big case voume as well, I think. Remington .300WM cases have the smallest volume, by the way, I would stay away from these). Unfortunately, .300 WM cases have been discontunued by Lapua a while ago, luckily I bought a life-time supply.