Second this, “on par” is far fetchedNot legal for big game in Oregon. Surprised that it is legal for Elk in Idaho.
Obviously Elk aren't armor-plated. And if you think like a bowhunter the 223 will put one down. But you don't have much leeway with a 223. You can end up with a hit to tag ratio greater than 1.
I am a little worried about this statement - "The terminal performance is on par with anything I’ve seen in a .284 or .30. Unreal performance. The bullet is a BEAST!"
No, it is not "on par" with 30cal fodder - not even a 30-30. It is a very marginal cartridge/bullet that CAN work if the shooter stays within its limitations. Sorry to burst your bubble, but better now than this fall when you post a sob-story about how you made a good hit and never found the elk.