I recently got a 91/30, and the trigger was heavy/grinding. When I stripped the rifle for cleaning/lubing, I did some looking at the trigger & sear setup.
Note: I'm not professional gunsmith, just a guy who likes to work on things.
This is what I did; may not be the right thing for you to try, or for your rifle.
There's a slot in the trigger, the sear/spring fits into it. When you pull the trigger, there are three flat angles on the top of the trigger slot that bear on the spring, looks like one is the first stage and one the second, looks like the third is just a relief step.
I used a thin file wrapped with 600 grit wet/dry paper to polish the angles in the trigger slot- do NOT change the angles, just polish!- and used a fine stone to polish the spring surface where the trigger bears. Again, don't take a lot off, just smooth it. Oiled & reassembled, made a huge difference in the trigger action.