I have had good experiences with monolithic bullets, and they shoot accurately in my rifles. I currently use 139 gr. Hornady GMX in my 7mm-08 and 150 Barnes TTSX in my .30-06, both in factory ammo. I really have no reason to change. I have only recovered one of those projectiles: a 139 gr. GMX from a decent whitetail buck shot directly from the front. The bullet entered at the junction of the neck and chest, tore up lungs along the way while traveling 2/3 the length of the deer, and finally lodging in the stomach. All others I have shot with these two projectiles have been pass-throughs, mostly through bone as I prefer shoulder shots. I have never hunted elk, and hope to some day, but I would not hesitate to use either of these projectiles on elk at reasonable distances.
