I have a .270 Standard conture and not stainless, so not exactly what your asking for... But ....
it shoots about 1" pretty easy, I have not really "Worked up a load" Just used some I made for a Rem 700. It may do better, but does not seem as accurate as other Handi barrells on the same reciever. But it was baought Used and I have no idea how it was treated or how much it was shot before I got it. PLENTY accurate for Hunting tho ! ~Ace~