Got this one at 580 with a Ruger M77 30-06 165sst with a Mueller TacII scope. He was walking straight away from me and the bullet hit him in the spine traveled up his neck and out the top of his snout. I did not know if I had hit him or not because he was gone when I recovered from the shot and could not walk to him because he was across the canyon. 24hrs later I could not take it anymore so I went on a road trip, and there he was. Just a young guy.
My farthest was about a month ago. Every morning and evening the coyotes were crossing a levee running tothe river between two corn fields. I set up as far away as I could hoping to get a long shot. The end or the levee was 850 yards. I was shooting my Remington 700 in 300 WM loaded with Berger 190 gr. VLDs at 3075 fps. The coyote crossed at a ditch running into the corn field. I had seen him cross at that spot the previous evening but couldn't get on him quick enough. But figuring he would cross there again, I ranged the spot at 508 yds. and dialed in the Nightforce 5.5x22x56 in for that distance and dialed in 1 MOA left wind. At dusky dark he showed up just wher I hopef he be. At the shot he dropped out of sight into the grass. I drove down to confirm the hit. It was too dark to see the entrance hole but there was no doubt where it came out. It almost completely blew off the far hip and leg. Unfortunately by the next weekend they had the corn picked.