7mm08 or .280 or .308?

[Mills]

Looking for one caliber to use on deer 85% of the time, elk 10% of the time, and antelope 5% of the time. I read somewhere that a 280 will shoot heavier bullets better (more accurately) than the 7-08. I'd like to load 160s in Partitions and shoot them at everything. I hunt in South Dakota and I've taken deer from 50 to 325 yards. Never been antelope hunting, and have shot one elk at 200 yards (used to own an STW and hated it). I do currently own a .25-06 Sendero (love it, but it's too heavy) and am looking to lighten the load. Which of the three would you recommend. Thanks.