Yeah if they are 10 round mags, they are perfectly legal everywhere. Maybe write or put a sticker on there that says "50 beowuf only" you know so you don't accidentally load it up with 223s.
Might have to neck it down to 49 cal , that way outlawing 50 cal won't get you. You know how important that change is to the Karens you know.
Up here, 450 Bushmaster is used by those in what was shotgun only deer-hunting areas. A couple years ago, they let hunters use straight walled cartridges in those areas. .458 Socom doesn’t fall under that rule.
I had a lot of fun with one, but I found the limiting factor was penetration. I could all but penetrate a 1/4" thick steel plate at 50 yards; it would leave this massive bulge out the back of the target, but never punch through. I figured that the .50 Beo wasn't able to do anything (that I was using it for) that .308 Win could easily do. In hard targets (I don't have any experience on large animals with it) I believe the cross sectional density limits the penetrating power. If I ever do the big bore AR again, it will probably be .458 Socom, .45 Bushmaster, or even the .350. I also had problems getting projectiles for my .50 Beo, there were only two options available at the time. Now you guys have dozens to choose from. I even saw someone had a solid copper projectile- that would be quite fun to blast old junker cars with, just to see what it would do. Back then, I used standard Gen2 Magpul PMags and loaded them to 10 rounds. The blunt tips would knock a little bit of plastic from the front of the magazine, but strangely enough I never suffered a jam because of it. I eventually sold the unit and used that money to help fund a .50 BMG bolt action upper receiver.