The way I look at it, once you are at the starting loads for most rifles, you may not gain even 200 fps by maxing out. Will that make any difference at all at 2-300 yards with a 270 class cartridge? If the start load gives better accuracy than the max, I'll use the start. If something in between is more accurate, I will still choose a load that can 1/2 moa better than the rest.
Funny thing, my .243 firing 100 grain sierras with imr 4350 is obscenely accurate at the max load. It shoots better than match bullets of other weights, and is pretty forgiving of charge weight changes from starter to max loads.