Easy way to compare. Well, easy theory, lots of separate lookups and calcs.
Look up the highest BC's of each company's hunting bullets, then run the numbers in a calculator that shows mid-range trajectory or max height over line of sight with each sighted in at 500 yards. Plug in muzzle velocities commensurate with those possible from different rounds. Lowest midrange or max height trajectory wins. You can then juggle the sight in range to get your best point blank range or most useful trajectory for whatever species of game you're after.
Obviously real world results may vary the calculated numbers a tad but at least you'd be comparing each bullet and velocity combination on a level playing field.
