If you're going to consider the .270, you might as well just get the .280 Remington and be done w/it. You'd be glad you did. The biggest difference between the .280 and the others you've inquired about is that you need to get the ammo from a real gun store instead of just walking into a Wally world type box store.(That can be a factor) The 280 has similar recoil to the .270 and its 7mm bullets are overall better ballistically . Standard and premium ammo is available to suit virtually any big game requirement.