Hi Michael, I'm from Idaho which does not make me an expert. But I've hunted elk a lot and killed elk with 243s up to 300 Weatherby's. Yardages from 150 out to about 450. The fastest thing that I've seen dropping elk was just my plain old 30 ought 6 with 180 grain round nose or spire point Sierra bullet. I'm not saying we're overthinking things here, but 30 ought 6 is just a little more of a 308. In many cases barely over a 308. I think any good hunting bullet will have you eating elk if you do your part. The most impressive bullet I've used was the Nosler partition. It was also the only one that I recovered, under the hide on the off side and it had mushroomed itself up just like the ad said. Either way you choose good luck. Be careful and happy hunting.