I've been looking at the 350 Legend as well and I understand they actually created an new case. nearly identical but not to a blown out .223. I'd also consider trying subs with a suppressor.

“You never need fear a man, no matter what his size. When danger threatens, call on me, and I will equalize.”
Samuel Colt.

�Common sense is genius dressed up in work clothes.� - Ralph Waldo Emerson