Individual guns, even of the same model, vary in their taste for loads, so take this for what it is worth.
I have a Deerhunter that I bought about 1994-1995, my first ML. I tried RBs, with a few different patches and loads. Nothing was remotely accurate. It shot ball-ets ok, but I eventually went with sabots in it as they grouped better. I think 1-48" is a bit fast for RBs in most guns.
As for quality, mine was old enough the sights were metal, though adjustable only for windage (with a hammer). I could hang the gun by my finger, cocked, and it would not fire. A 'smith friend filed the sear for me, and I went on to kill more deer with that gun than any other. I bought another Traditions after that, with another quality issue. I agree with the others; save a few months longer, get a better quality brand.