ML McPherson recommends a non-invasive trigger procedure that is pretty much an expedited wear-in that accomplishes years of use in a few hammer falls, it's been discussed on the forum before. This procedure works on some, others it doesn't, just depends on the trigger mating surfaces. He calls it marrying the trigger parts, it's done by applying about 20lbs forward pressure(more can break something!) on the cocked hammer while squeezing the trigger, repeat about 10 times. Block or hold the hammer from striking the transfer bar/firing pin to prevent damage to those parts, or use a spent case in the chamber.
Tim