If I read beretzs's data correctly, the .25-06 has a 55 fps advantage at 59.9 kpsi for the powders he chose for the Partition bullets comparable in sectional density. That is practically a dead heat when considering all of the variables that affect velocity. As someone pointed out earlier in the thread, once you get to the 120 grain-class bullets, the 6.5 has the advantage in ballistic coefficient that more than makes up for a slight difference in muzzle velocity.
