I used a 280 a lot until I learned it didnt work any better than a 270. I had mine rebarreled to 270 after I tried to buy but could not find one box of factory ammo. I was driving across southern Idaho into south central Wyoming to shoot an antelope. I stopped at every town from Boise to Soda Springs and all the places across Wyoming without finding a single box. Yes I went into every town and every store. It is a G33/40, Burgess metal, Monty Kennedy stocked outfit so it was a big deal to put a new barrel on it. I still have it. The 308 is great but I like the extra velocity of the 270. You can find 270 ammo everywhere big game is hunted.
Shod - Guess who started the 270 aspect in this discussion