S&W 745 hammer bounce? - Pistolsmith

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Old 12-03-2005, 05:02 PM   #1
Join Date: Jun 2005
Posts: 4
S&W 745 hammer bounce?

I have an S&W 745 and use it for limited class pin shooting. I noticed that when dry-firing after a table is shot, before benching the gun (we must bench with the hammer down), The hammer bounces back to half-cock. It didn't do this before. The factory mainspring is 20 lbs. I have been (for months) running an 18 lb. Wolff to slightly lighten the trigger. I thought the spring may have something to do with it and put a 20 lb. back in. The hammer still bounces back to half-cock. The trigger doesn't reset, however, so I have to pull the hammer back and then pull the trigger to ease it all the way down to rest. The firing pin channel is clean and the pin moves freely. The gun runs well otherwise. I don't see light strikes on the spent primers and the hammer will go all the way down(and stay down) when I do the pencil test. I even tried a new,spare factory firing pin "just to see" but the bounce remains. Weird, huh? Any ideas? This is (to me) Smith's simplest auto-pistol which makes this even weirder to me.
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