I have a ball doing that! That was my 5th trip to Wyoming and I've extended my kill distance each time. It still amazes me that it could even be done, but reading articles like the one Ernie wrote convinced me that it was possible. That was all the encouragement I needed!
The gun is one I built myself. It is a BAT MB action with a Bartlein 5R, 8 twist 30" barrel. I was shooting 31 grains of Varget out of a Lapua case with a turned neck and a 105 Berger hybrid.
I could not find a hole in the dog I killed at 1059 yards. I think I actually hit the ground right in front of it and the bullet bounced up and hit it in the ribcage sideways. The ribcage was obviously broken up. The one at 1296 yards was hit in the head and just fell over and kicked right where it stood.
Ernie found a bullet on one mound I had been shooting at and it had the barest minimum of damage to the meplat. He told me on the two way radio when he found it that I could load it up and shoot it again. It was that perfect. Just goes to show how little energy they do have after going that far. That may be why so many of them still run down the holes after being rolled over by a shot. I rolled another one at 1200+ but it got up and went down the hole. Ernie rolled one or two with my gun at that distance. He complimented me on how well it was shooting.
Perusing the long distance clubs on the Varmint Hunter's Association made me wonder how many of those people had shot coyotes or big chucks to get their long range badge. Not to detract from that at all, but a PD is a bunch smaller! A friend of mine killed a dog last year at 1071 yards with the gun I built for him (BAT MB, Krieger 8 twist and 105g Amax). It was his first time at over 500 yards and he got it in less than 30 shots (4th shot on that dog) and it was a pup the size of a chipmunk!
Ernie taught me a lot. The most important thing I learned from him was to pick the right conditions for those long shots by going early in the morning or right before dusk. That's when the wind and mirage are at their least. Dogs we couln't even see the day before through my 50X Schmidt and Bender were sharp and clear in the still of the morning when I made the long shot. It's a numbers game, and when you get the scope adjusted and hold right on him and one shot goes just over his back and the next shot with the same hold is just low, you know it's only a few shots away until one goes in the middle. Even at that distance the sonic boom will spook them after a few shots, so you have to compensate for range every time you move to a new target. I finally got one that stayed put at 1296 yards and nailed him on about the tenth shot. I nailed the one at 1059 yards on the 4th shot.
I shoot a 30BR barrel on that same gun in score matches during the summer and it won a LOT this year. The only remaining question now is; do I want to do a third barrel for this switch-barrel rig in .284 and go for that mile shot! I have all winter to decide.