I grew up in Wyoming and harvested a bunch of Wyo antelope when I was a kid with a 270 with 150 grain noslers. I use 150 grain because I used that round for deer as well. 270 is a little small for elk and other game such as mtn goat so I switched over to a 300 WSM. About the same amount of kick with my 300 WSM as I had with the 270 but the 30 caliber has more punch!