I run into this nonsense when talking to African hunters too. I guess everyone forgets that one time a single generation of American hunters damned-near exterminated the North American bison with 45-70. We went from horizon-to-horizon oceans of moving flesh and fur to "ya don't see em no more" in less that twenty years.
Yeah. With vernier tang sights, 600 yards is doable. And if you’re shooting into massive herds, with no regard for what you hit, or where, and you have hundreds of acres of grass to locate your kill in, or don’t care how many wounded animals escape, it’s great bison round. Around here, a marginal hit on an elk in steep terrain, possibly raining, means you’ve likely wasted your hunt.
Much of Africa mandated solid copper bullets because they got tired of wasted game, and scraping Fudds out of buffalo hooves when their “buffalo guns” only succeeded in pissing off dangerous game.