If I had to use one bullet for all game with the 30-06, I would use the Nosler 180 grain Partition bullet loaded by Federal in thier Premium line of ammo. If you reload that would be my pick as well. If you don't mind changing weights then you are correct in assuming that the 150 grain is best suited for deer and antelope. I would still stick with a good Nosler or other premium bullet. The Grandslam from Speer and the 150 grain Hornady innerlock would work real well. Also the Barnes X bullet in either 140 grain or 150 grain. I am currently loading the Nosler Ballistic tip and the Sierra Pro Hunter in my 30-06 Pump rifle. Federal loads the pro hunter in one of thier cheaper lines of ammo and I wouldn't be afraid to bet my hunt on that combo either. For Elk and Moose though, stay with a good 180 grain bullet.