I've shot a bunch of elk with a 270. Cows aren't all that hard to kill. I had great luck with Speer Hotcores, 150 gr. The 150 will shoot to almost the same POI as a 130 and hit a bit harder when it gets there. I've also used Partitions but I really couldn't see any improvement over the Speers. They had about equal penetration and weight retention.

“In a time of deceit telling the truth is a revolutionary act.”
― George Orwell

It's not over when you lose. It's over when you quit.