I've got the Stevens 840 (same gun) that was my dad's. He filed the trigger ALMOST too much. He was loading 22.5. Grains imr 3031 and 50 gr.nosler. I put together some 52 gr berger loaded with 20 gr. H 4198 that shoot really well. Loading at max with some 50 gr hornady I had pressure signs, stiff bolt lift. My biggest issue with a bit square mount is I can't get a good check weld. I added a neoprene pad, but thinking of trying a Boyd's adjustable comb stock.
