The elk I took with the .270 although well hit and not stress, did run much farther than those I took with my .300 or .340... Could just have been that elk..
I've shot a truckload of elk, about 50-50 with a 270 and a 300 WSM. I haven't seen any difference in how far they've gone after the shot. None have ever gone more than 100 yds, most less than 10. I pick my shots and have passed up quite a few questionable ones.