I was looking at factory cartridge ballistics and it looks like the 7mms carry their energy way farther. I know its all about where you put the shot but at 512 yards with a .243 sounds kind of unethical. Sounds like you made the shot, but the energy would be much lower than the 1000 ft-lbs supposedly needed to make a clean kill. 400-500 yards would be a really long shot by my standards. If I practiced enough that I could hit reliably at that range the deer are definatly out that far in the fields where I can't really get much closer. 250-300 would be a "far" shot. Are there any of thosereticles that really work on long shots? Seems kind of suspicious to me.