I've used these bullets a ton in the last 3-4 years and I must say I've seen nothing but quick kills. A friend of mine put one through an antelope at 800 yards and did not hit bone, bullet went through the heart and exited the animal leaving a 3x hole from the initial 7mm. He was shooting the 151 Cayuga at 2950 FPS out his 280AI. I've killed a barbary with the 151 Cayuga personally, It was not a great shot but it caused a TON of damage after hitting the top of the spine. Shot a mule deer with it and he went down, straight through the front shoulder, tons of damage on that one as well. Another antelope at 700 yards with the 6mm 100 gr. Dropped like a rock through the front shoulder quartering-to slightly. Same friend shot a smaller bull elk at 600 yards with that same 280AI 151 PVA, Crushed him though the front shoulder, couple steps and down he went.
I am not going to claim these are the best bullet on the market and definitely don't have any association with the brand but so far the guys I hunt with have been extremely impressed by these bullets and we have had fantastic results with them. I think that they are different than a barnes and I'm not so sure that they are similar to a hammer in how they kill but they do what they need to do. I will keep using them in the future.