The hammer spring will work together with the trigger return spring to determine the weight of the trigger pull or the weight at which it breaks. I like light triggers, about 2 lbs. or so on a blackhawk, so I use a 18 or 19 lb. hammer spring with a 30 oz. trigger return spring on the new model blackhawks. The old models with the coil trigger return spring are only offered in one reduced weight which is not published from Wolff.
The advantage of the lighter trigger pull will help keep your sights on target as you release the trigger. The lighter hammer will make the action feel smoother and less fatiguing. Going too light can result in light primer strikes, so if you buy the Wolff calibration pack with the 17, 18 and 19 lb. springs you can choose the one you that ignites your primers at the lowest weight.
The extra power springs are intended for really hard primers and I don't use any of those in the pistol cartridges. Some folks feel light triggers are unsafe, however if you don't put your finger on the trigger until you are ready to fire like you should it will be no problem. I have used triggers from 3/4 of a pound up and once you appreciate a fine trigger you can really tell. For your intended purpose the reduced springs are what you want.
If you decide to test the reduced weight springs by firing just primed cases be sure to grease the bore first (makes cleaning out primer residue easier) and to enlarge the flash hole on the case as without pressure on the case from burning powder the primer will back out of the case and cause the cylinder to jam. Opening up the flash hole will allow the pressure from the primer to escape forward rather than backward pushing on the primer.
Last edited by Tom in Arizona; February 27th, 2012 at 06:58 PM.