kermit hunter wrote: 3000fps probably is "CAPABLE", do any manufacturer's make anything that will take that pressure? Doubtful! I've seen supposed reports of guy's pushing 2500fps with bolt guns, that's on them.
by capable im sure they mean "wont come apart" - not necessarily that it was a realistic velocity in the 450 bushmaster.
they might have used something like a Raptor to get there... which tends to run a bit hotter speed wise than the bushmaster does with similar bullets. i dont doubt a long barrel raptor loaded up WAY hot, would be able to get that extra 500 ish FPS needed to cross the 3000 fps mark.
or even a 460 S&W... match grade machine got the 250 ftx running 2597 fps in a 26" TC barrel (42gr lil gun, which doesnt seem off the ranch at all for what i can find online for this bullet in the 460) and just shy of 3000 with a 200 gr ftx factory load in 27" TC barrel. those are real world loads and not special hot-rods that us mere mortals couldnt load up and shoot in a production barrel.
either way im also quite sure that hornady's test barrels are quite a bit stouter than anything thats practical in the real world - if nothing else for safety reasons during new cartridge testing.
just my $0.02 anyway