To amplify bountyhunter's comments a bit:
This little tip has saved me a lot of testing time: When you are trying to reduce the trigger pull weight of your 625 (and for all revolvers), the most important weight to consider is at the hammer, not at the trigger. Once you go below your minimal hammer fall weight the gun will misfire.
So when adjusting your trigger pull weight always put the trigger scale at the hammer and make sure it does not fall lower than your minimal hammer fall weight.
For example, for my particular 625 I found that I can get 100 percent ignition with Federal Primers when my hammer weight does not fall below 2 lbs (first making sure like 2alpha says- primers set deep and no bent moons).
I can polish or mess with the mainspring screw as much as I want but if that hammers falls below 2 lbs I will begin to get misfires.
After setting your gun to the minimum hammer fall weight, reducing friction (and rebound spring) becomes the most important element in reducing trigger pull weight, so polishing and other friction reducing methods come into play.
So find out what your minimum hammer fall is for your gun, and do your trigger job making sure you never go below that minimum poundage.
Hope this helps,
Paul
(Edited by phara at 12:55 pm on Jan. 20, 2003)
(Edited by phara at 12:57 pm on Jan. 20, 2003)
(Edited by phara at 1:02 pm on Jan. 20, 2003)