If you want an investment, buy ammo and sell right before the election.
I'm afraid it's too late for this. Ammo prices already suck.
As far as too slow of twist, I don't mind shooting 45 gr in my 223, so I wouldn't mind with a 222.
I just don't want the gun to depreciate due to it being a 222. I personally like the gun more than I like some of the new rifles.