Listen to what THR members are saying, there is not a bunch of difference between the .270, .280 and .30/06. If I drew a elk tag and I owned either of these, I would load up and go with absolutely no reservation. The .270 is faster and lighter, the 06 is slower and heavier. If you load heavier bullets in the .270, it is slower, with very little less energy. the same can be said of the .308-7mm/08 discussion. I have seen lots of hits with all of these and with a good bullet in a vital area.....DUN done! Personally, I feel that shot placement is king. Get what caliber you want, shoot it a lot, get confident with whatever you carry. But, if you want a different caliber or brand of rifle, get that one too. If you stay in a recommended caliber range for the game you hunt, you will be fine, just match the bullet to the task.