I bought a Mountain Ascent factory new in 308. Used it on a hog hunt and wished for a lighter pull. I am not a gunsmith and absolutely encourage using a gunsmith if you are not entirely comfortable doing this yourself. I have installed triggers and adjusted them on a number of different action types. Never before on a Kimber, though.
Bottom line - it was a snap. Took 10 minutes.
removed stock and magazine "shroud"
covered rest of action with a rag
did adjustment on bottom screw in front. didn't touch the others
sprayed carb cleaner on the factory Loctite covering the nut and screw
used a wire brush to remove the residue
loosened the nut with a really small crescent wrench
using trigger gauge to test the factory setting - 70 ounces.
turned the allen screw outwards (counterclockwise) one turn
this lowered the pull about 15 ounces
repeated until I'm at about 40 ounces - 2 1/2 lbs seems ideal for me.
holding screw in place, tightened the nut
put a dab of nail polish on screw/nut assembly
reassembled rifle, cocked it, and jarred it repeatedly to make sure the gun wouldn't fire. It didn't, but if it had, I would have started over. Or, gone to a gunsmith.
done - and safety has to be the paramount consideration.
Hope this helps anyone who wants to lighten the factory setting. Love the gun, by the way.
Hope this helps.