It's new world out there when it comes to bullets. While the Hammer bullets are a monometal bullet likes the Barnes, the killing mechanism is different. The Barnes tries to imitate a lead core bullet's expansion to kill with gross tissue destruction, but doing it with copper. The Hammer design takes a different direction and kills by hydrostatic shock, with the petal shards doing secondary damage and the bullet shank providing deep penetration. The Hammer bullets are extremely effective at killing, won't blow-up on close shots, and are also very easy to work up an accurate load for a particular rifle. With Hammer bullets, run a light-for-caliber bullet weight, and run them as fast as they will go. It is like reaching out and hitting the "off switch."
Not saying other bullets won't get the job done, either. And, with their low BC due to the copper construction, Hammers may not be the best choice for the 500+ yd shots, But for "normal" hunting distances, Hammer bullets are the easy button.