I have one of the One Book/ One Caliber reloading books for 300 win mag and looking at the Barnes section the 165 Grain using 78 grains of RL22 has a muzzle velocity of 3137, but 180 grain has a muzzle velocity of 3103 with 75.5. This does not seem right. Could someone check their reloading manual to validate this, I'm 99% sure this is wrong.