I own a 300 Weatherby Mag, with a 26 inch Magna Ported barrel . I would happily hunt Elk with that rifle, I think a 180 or 200 grn bullet with a High BC. would be adequate for elk at 400 to 500 yards, perhaps even a bit beyond that distance. I would take the best load I could make, test it a my local 300 yard range , and then spend two days at the LR Bang Steel Shooting School, with that rifle, prior to the Elk Hunt . Shoot at least 80 rounds in two days in preparation for the Elk Hunt . Just my opinion.