I never said you couldn't use it for elk. I only said I use my 6.5 Creed for "deer size critters". I have all 3 cartridges you mention but I primarily run the 140 Berger's out of my 6.5-284. I have not changed that load in over 10 years and have no intention at the moment. If I do I'll run the heaviest Hammer Hunter I can which is the 123 and it will be a grass burner for sure. I have a older Savage 116, 6.5-284 Weather Warrior, and I'm pretty sure it's a 8 twist but it's a tack driver with the 140 Berger's. Anyways....cheers