I bought something like that from CA one of their MPP… it was a .308 with 12” kind of a novelty so I rebarreled to 16 to throw a proper stock on it. Kept it .308 it’s good to about 450 with 168 eld-m
I would probably opt for the prc just to squeeze as much velocity as you can from it, or a 6 prc or something super fast