Well, this is debateable, but I have used a .270 for years with good success using quality factory loads topped with either the fail safe bullet or with partition. Lots of people use the 30 cal. rifles from the 30.06 upto the .338 mag. From what I've seen by hunters in my camp, is you can't go wrong with the 30 cal. rifles loaded with quality ammo. topped with the partition, bear claw, scirocco, or the barnes X bullets. All of these bullets will retain very good weight which will give good penetration. In the .270, use at leat 140 gr. or the 150 grain bullets. In the 30 cal., use 180 or 200 grain bullets.