UP, If you are committed to the Ascent, that is your choice. From that point, I'd give the nod to the .270 over the .308 for down range ballistics. I'd be pursuing the .277 bullet lineup for some of the top BC values and checking what the Ascent likes. A cursory glance shows the 140 and 150 gr Accubond as being close to .500.
Good luck
That makes no sense. If you're going LA, and choose the .270 for downrange performance, you've chosen the worst of the three options in the LA for downrange performance. Either the .280AI or the .30-06 offer better downrange performance options than the .270 when factoring in BC. In short action, to save weight (and if you're getting the KMA, then you are counting grams), the .308 offers sufficient downrange performance based upon the BC options in 168-180 grain offerings.
