No, the SP101 trigger will not get lighter without addressing the 14# factory hammer spring. Ten thousand dry or live fires may smooth the action but the trigger will be no lighter.

The coil spring in the Ruger rides on a stamped hammer strut that is usually quite rough. Sometimes it can be so rough that the coil "snags" adding to the gritty feel.

If you are feeling brave, remove the spring and hammer strut. Polish out all the rough spots on the strut where the spring rides and break the four edges so they scrape less on the inside of the coil.