If it's worked before, use it again. I like Barnes TSX or TTSX. Been a proven performer. Some people here think the 6.5 Needmore is sufficient for Elk, others will say just hit 'em in the vitals and they'll die, a few rationalize Jack OConner used a 270 for everything, and then there's the final coup de grace - poachers use .22's to kill elk all the time argument, all of which make elk seem as easy to put down as a squirrel. My take is a good bullet, partition, solid copper, or similar is required and the rest is irrelevant, except for distance. A 30-30 will take an elk at 100 yards. A 300 wm - shooting the same 180 grain, .30 cal. bullet will take an elk at 400 yards. My experience has been that each elk is different, some die fast, others will run 100's of yards - given the same bullet, placement, and distance.