Here's my take on Hammer hunters, just the 143 grain .284. Shot out of a 7mm rem mag. Killed a bull elk, my shot was high and elk dropped dead, wonderful!!. Son shot a mule deer buck at 150 yards, speed 3,010 ft/sec. 1st shot was right behind the front shoulder, double lung. Deer did not seem hit, turned around 180 degrees, I'm watching form 400 yard away thru spotter and see the spot it hit--thinking it's a very good shot. Shot #2 goes into the deer, another behind the shoulder double lung hit, I see that one thru the spotter also and think dead deer. Buck shows no sign of being hit and then starts to trot down hill. I'm thinking son don't shoot again but shot #3 goes off and hit the deer in the spine, crap back straps are going to be missing. Deer goes down. Upon skinning we find lots and lots of copper fragments (small pieces) against both sides of the hide. Both shots thru the lungs were 2-3 inches apart. Hole in is .284 and the hole out is .284. Deer trotted 50 yards when 3rd shot dropped it. Zero blood from where it stood. Lungs are destroyed. The bullet did its job but I like a blood trail. Cow elk. Shot at it once at 200 yards. I swear I hit this cow. Standing broadside and I have a good rest. At my shot other elk jump up and they all bunch up so no chance for a follow up. Had snow on the ground and could not find any evidence of a hit. Searched for over 4 hours and not one drop of blood. Even went back the next day and searched again. If the cow was anything like my son's buck deer it's laying dead and I couldn't find it. Won't use them again in think heavy cover. Barnes usually gives me a pass thru and two holes for blood to come out of, and a lot bigger exit hole. I know others have had good luck, good for them, just my experience and my choice not to use them again in thick heavy cover