Longest shot I've taken was just under 500 yrs in Wyoming on an antelope, using my model 700 30-06, been years ago now so I cant remember load data exact, think it was 165-168g nobler ballistic tips. I sat in a ditch with bi pods down, took me forever to calm down enough to do it, I was 15 at the time.
Edit: just realized this was in elk hunting section. Longest shot I've taken was 140-145 yds offhand. 180g factory remington core lokt out of the same 700. Only time I've shot at/ shot an elk. 3 years back on opening morning in 364