I have 3 - 6mm x284 wildcats. My longest shot on a deer with it only 325 but I took my first and only coyote at 550 yards. The guy in my area that got me on to them has taken over 21 bull elk in Colorado since 1978. He has taken them out to little over 700 yards. She uses the old discounted 100 grain Nosler solid base bullets which he bought several k of before they discounted them. He has a gun shop and does some gunsmith work. The main thing is he is one heck of a shot he uses a dot system developed by premier reticles but they do not do that service anymore. I was with him on his last 2 kills the one was at 625 he shot 3 times and connected 2 out of 3. The damage it did was unreal on that elk seeing it skinned out it looked like a larger caliber. With the 6x284 you of course have more case capacity than the standard 6mm and get more vel. I use them for deer hunting in Pa. shooting the 85 sierra bthp. I load 53 grains of IMR 4350 and get 3450 fps. The 100 grainer I mentioned he uses 51 grains 4350 around 3300. My long range shooting buddy got one and loaded the Berger 95 only going around 3000 + we shoot milk jugs at 1k with it. We actually have a gong at 1100 yards with him hitting it another person sat down first shot and hit it too. That says something for the gun and bullet. However, I wouldn't shoot at an animal at that yardage with it don't know what it has left to do internal damage or not. I tried my 85 grainer at 1k and I couldn't of hit an elephant with it. My back to back shots was like 20' different point of inpact. You need the higher bc bullets to do that with my 85 is very poor on BC. I just had a 6x47 Laupa built getting ready to work loads for it.