I strongly suspect that the 92 winchester would handle it, but of course one would need a Rossi, wouldn't dream of doing this to an original '92. m sure that it would be at the limits of the cartridge length the action would handle. The '94 would take it no sweat, just a little heavier is all.
Badnews Bob, My Maxie shot as you describe, shooting 3 or 4 of 5 shot tight while 1 or 2 were a little wild. Sereral things changed that. One was simply shooting the gun. A lot. i was taking mine out everyday and shooting a 158 grain lead plinking load, 20-30 times a day. I also did a lot of experimenting with several 200 grain bullets, but am at this point convinced that what helped was opening and closing the gun all those times. I probably shot 2000 rounds through the gun. I don't remember when, it just kind of sneeked up on me (the same is true of my 44 as well) but i did notice that I was no longer seeing ridiculous flyers. Yeah, I might have a rond or tow that opend a group to 1.5", but gone were the days of 2" and larger groups. I got very consistent wit the gun and could shoot 5 rounds of a Remington 200 grain bullet into 3/4" on demand. It shot that well.
The other thing that helped and the only change I have made to the guns is stoning the trigger and hammer and replacing the trigger return spring (adds at least 2 pounds to the trigger pull weight) with very light springs. I took mine off retractable ball point pens. Had to make the bore in the guard a little deeper, did this by hand with a drill bit. The triggers on all my NEF's are about 2 pounds and very clean.
I have never said anything about this, but I think the best fix for the forearm is simply not overtightening the stock screw and working the action open and closed untill it seats in. Sans that, the next best fix would be to open the barrel channel up and bed the area from just forward of the stock screw (not more than 3/4") to the reciever end of the stock, leaving the remainder free floated. This allows a consistant torque on the stock screw, and isolates the forearm/barrel contact. It will require that the bedded area be where you hold and rest the gun when firing. Just something to think about. Good Shooting, enjoy that Max, JP