We were talking about and trying a while back?
I came across a bit of information about that and some hunting stories.
"Bushmaster Firearms and Hornady, fans of the AR looking to take power to the next level have a factory-produced option in the .450 Bushmaster. A 20-in.-barreled rifle and a 16-in.-barreled carbine in the beefy cartridge"
This is the gun that the 250FTX was designed for if my info is correct
some of the information[I assume its correct] that was included was that it takes 2200 FPS for this bullet to expand properly.
Granting that it is supposed to get expansion to about 5/8" and roughly 22 inches penetration according to the story it did a number on a quite a few boars.
I thought some of you might find this interesting enough to comment on. Lee