OK well Im going to take a stab in the dark at this one and suggest MAYBE you have a long freebore so the powder charge will need to be higher as projectile starts to move before full detonation..like a weatherby is supposed to do.LRAB is going to make that even more so being long skinny front end.
I know someone here has one,they worked up load data by going the 30/06-----.280----270----- -------25/06 method your 6.5/06 slotting into the gap so reasonably safe bet charge weight or projectile weight will give you a near as damnit straight line from the data you have got.
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