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Bulletpusher said, "The 30-06 works better than the 308 with the same bullet weights but the differences are minimumal, that is untill you get into the heaver bullets. That is where the 30-06 pushes further ahead of the 308."
Permit me to disagree slightly with that statement. I keep hearing that old line that the .308 cannot do well with heavier bullets, thus giving the 30-06 an advantage.
Now this has to be just a hair on the apples and oranges side of things, only because there are no factory loaded 220 gr. bullets in .308 Winchester.
Now Winchester advertises 2400 FPS with a 220 gr. bullet in 30-06. With judicious handloading, I have safely loaded a 22" barreled .308 winchester with 220 gr. Sierra round nosed bullets to 2260 FPS and have one load giving 2300 FPS using W-760 powder. If I could find a box of factory Winchester 220 gr. loads for the 30-06, I'd run them over the chronograph. I'd be willing to bet, that based on velocity testing of Winchester's 180 gr. Silvertips, that the 220's would be closer to what I was getting from the 220 gr. 308 loads.
Assuming that Winchester's 220 gr. load does in reality give 2400 FPS, I don't see where 100 FPS less from a .308 is any real disadvantage.
Be advised that I worked up the .308 loads in a Winchester Model 70 with a 1 in 12" twist. Using another brand of rifle having a 1 in 10" twist will most likely cause pressures to be higher.
FWIW, accuracy was fantastic with groups in the .375" range at 100 yards from a sporter in a Ramline stock. Scope was set at 9X for the tests.
Try it if you want, but data is scarce for that heavy a bullet.
Paul B.
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