How experienced are you with your 270, or with 308, 30-06, etc and other rounds in the same power range? Do you have a flinch? How do you perform with standard ammo. After working with my 22 for a year and returning to the bench with my -06 and reloads, I started shooting MOA groups. I blame myself more than the groups, the scope, etc, though it was pointed out to me that my scope may be causing an issue as I tend to make 2-3 ragged holes on a target rather than one.
How much time are you allowing for barrel cool-down between shots?
Are you using a benchrest machine? If so are you accustomed to it? I used a bench once for about 15 rounds and was consistantly making 2in groups. Went back to my bipod for the next 5 and kept everything in a 1" circle in the center of the target.
Don't let it frustrate you, you should be good for deer, but I have a hard time believing that your rifle won't group MOA if it's a new 270, but then, I tend to blame myself a little too much sometimes for my groups to the point that I can't see equipment failure, but definitely check your breathing and your trigger control first.
good luck.