j.trevor123,
When you cock the rifle, the seer, which is the finger sticking up from the trigger, catches the full cock notch on the hammer. There are two notches on the hammer. The half-cock is deep so the seer can't get unhooked, while the full cock is shallow and flat. When you pull the trigger, the seer slips off the full cock notch, releasing the hammer so it can strike the firing pin. If the surfaces of the seer and hammer notch are rough, it takes more pressure on the trigger to slide the seer out of the notch.
What you want to do is polish the surface of the seer and of the hammer notch so the seer slips easily out of the notch. This is usually done with a small, very fine sharpening stone, hence the term "stoning." You have to be carefull to keep from doing anything more than polishing these surfaces, or you could create a dangerous situation. If you have any doubts about being able to do it, take it to a gunsmith.
-Winter Hawk-