here is some real ballistics of remington.com all the same cartridges

ENERGY (ft-lbs)
Cartridge Type Bullet Muzzle 100 200 300 400 500
Premier Core-Lokt Ultra 100 PSP CLU 1945 1629 1356 1120 917 745
Premier Core-Lokt Ultra 150 PSP CLU 2820 2305 1868 1498 1188 933
Premier Core-Lokt Ultra 150 PSP CLU 2648 2159 1744 1394 1102 864

243 is on the top then the 30-06 then the 308 as u can seee the 243 is well below the 30-06 and the 308 right up to 500 yds. and energy my friend is what kills. now ZERX hopefully u learn something here