Gawdy magazine ads, paid shills. Nothing beats hands on testing. Or test results from someone you can trust. Either a knowledgeable friend or a writer. Aagaard comes to mind. When he tested a bullet, he TESTED a bullet. And he took you along with him every step of the way. And when he made his summation, it was in a manner that you could understand. And it was pure gold. he wasn't for sale to the highest bidder nor was he one of the "this stuff cost more so's its got to be better" guys. Too often that's the only yardstick folks use. And it's a poor one.
I've only shot 1 head of BG beyond 300 yards and if I remember correctly, that was with either a core lokt bullet or a NP. So I have no interest in a bullet designed to kill something at 450 yards. IMO, all bullet ads should carry the header: PLEASE DON'T SHOOT AT ANIMALS BEYOND 300 YARDS MAX, AS NOT ONE HUNTER IN 10,000 ARE CAPABLE OF CONSISTANTLY MAKING A SHOT OF THAT SORT. HAVE A LITTLE RESPECT, WHATA YOU SAY.
I think a more reasonable performance window would be 100-200 yards. And with a properly sighted in rifle, this should give you a "dead in" aim of 50 to around 250 or 275 yards. We know from my example of one that a 150gr core lokt or NP from a .280 will kill an antelope (and I'm sure a WT) at 380 long steps. So where you'd need the magic bullet is if you need a light for calibre bullet to drive at warp speed to try and compensate for inability to gauge distance or figure trajectory. In which case, I can't help you. I'm from the old school, if you're driving a hunting bullet over 3000fps, you need more weight not more speed.