Oh, here we go... (face palm)
Guess and get lucky? C'mon, man! Luck is when preparation meets opportunity! I've made that same shot with my AR10 in 6.5 CM. Can your short ass barreled 260 get out there? Hmmm... We'll have to see about that. And as far as your hand loads being SLIGHTLY more superior, I'm pretty sure mine have been proven to hit steel at a mile. Twice, now.
Remember: Run your bolt, not your mouth. :-)