My grandpa killed a big 6 pt bull with his 30-06 at 620 yds. 180 grain Nosler partition. It was in the snow and he thought he was closer. He never used a rangefinder and guessed it to be 500 yds. His bullet hit by its feet and he could see the splash and held over accordingly. Next shot he double lunged it. Walked up to 300 yds and finished it off. It was laying down with it's head up. He was a land surveyor and got the distance off his topo map. I killed a cow elk at 545 yds last year and a bull two years ago at 646 with my 270 wsm. 170 grain Berger out of an 8 twist barrel. With this combination it's really easy to kill deer, hogs, elk and antelope out to 800 yds. It's really fun to shoot!