The only valid comparisons come when you use bullets with a similar Ballistic Coefficient, which you have failed to do, The 130 grain .270 bullet is ballistically superior to the 150 grain .30 caliber bullet reguardless of shape because it has a higher sectional density. A 165 grain .30 caliber bullet would be a better comparison. I haven't any knowledge of the 180 grain .338 bullet as to its density, but it may be roughly similar to the 150 grain .30 caliber.