".30-06 would be fine but there is less recoil and flatter trajectory with the 270."
On paper maybe but not in the real world. The .30-06 is better than all it's off spring.
In the real world, using rifles of equal weight and bullets of equal sectional density, and similar design (Partitions, for example), the .270 does in fact shoot flatter than the .30-06 and does so with substantially less recoil.
Let’s use Nosler 6th data and assume a rifle/scope weight of 8.3 pounds:
.270 , 130g Partition, .416 BC, 3158fps, 54g powder
.30-6, 150g Partition, .387 BC, 3056fps, 58g powder
.30-06, 165g Partition, .410 BC, 3002fps, 63g powder
Now let’s zero for Maximum Point Blank Range for a 6” diameter target (the bullet is never more than 3” above or below line of sight):
Cartridge/Bullet Weight = Zero range/MPBR
.270 Win/130g = 263/309
.30-06/150g = 254/298
.30-06/165g = 251/295
Recoil?
.270 Win/130g = 16.9fpe
.30-06/150g = 20.4fpe
.30-06/165g = 23.9fpe
The fact of the matter is that “better” is a subjective assessment and requires specific parameters to be used as the basis for comparison. In this case the stated parameters included mild to medium recoil with 1600-1800fps at 350 yards. The .30-06 can provide the energy but generates significantly more recoil to even get close in terms of trajectory. Looking only at the parameters provided, the .270 is a “better” fit for this particular application.