All I can say is anyone shooting at game at 500 yards with the 30-30 darn well shouldn't be. Hitting a target after several feet of drop, with a platform typically capable of 2-3 MOA at best, isn't very likely, regardless of your skill level. When differences of a few yards can result in feet of difference in bullet drop, the proof would be in the pudding for me, and not in an internet post saying it "CAN" be done. Having shot the 30-30 a fair share, I feel I have a realistic grip of its capabilites, beyond my own. But "500" unmeasured, guesstimated yards on a game animal......there are probably very few shooters IN THE WORLD capable of such things, and even then, doubt their consistency given period-specific (1920's) ammo, guns, and sighting equipment.