The 25.06 is going to have a higher muzzle velocity, but the .243 is a little flatter shooting.
Where do you find data supporting that statement.The Federal and Remington data indicate that the 25-06 is flatter shooting at 500 yards.
http://www.federalpremium.com/products/compare/rifle_compare.aspx
http://www.remington.com/products/am...5062*PRC2506RA