180 Nosler Partition &165 or 180 Barnes TSXwould be my first choices. Though other such as 180 Nosler accubond, 165 or 180 TBBC, 180 Hornady Interlock Sp, 180 Hornady Interbond, 165 or 180 CT Failsafe, 180gr Swift Aframe will work well for elk. Go with the one that shoots the best in your rifle.