When I helped a friend get into deer hunting a couple years ago I had him pickup a montana in.270 as a do all. When I helped him sight it in the recoil to me was hardly noticeable, I know the stock design works for many folks.
Another thought is, when in the past I had owned a couple 84's they seemed too "smallish" for me (I'm 6'2" on a good day), the feel of the 84L was much favored. I'd suggest Bwinters, you handle both long and short montana's before you buy.