zrexpilot-Try using the federal 100gr barnes x load for the 25-06 and at 500 yards the velocity is listed at 2140fps.With a 200 yard zero this load will only be 34.8" low at 500 yards.Or you can use the federal 115gr nosler load which has a 500 yard velocity of 2070fps and with the same 200 yard zero it is 35.8" low at 500 yards.Both of these loads shoot flatter and carry more energy than the 243win load that you use as an example.