I bobbed me hammer on my GP-100 and no issues with reliability. Spring pressure is what will make it go bang not hammer mass. If the latter was the case then how do all those semi-autos with skeletonized hammers shoot without issue??? Take a look at the hammers that are available for the S&W 686. Virtually half or better of the hammer has been machined away and they function like a raped ape. 
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NRA Life Member, NRA Chief Range Safety Officer, NRA Certified Pistol Instructor,, USPSA & Steel Challange NROI Range Officer,
ICORE Range Officer, ,MAG 40 Graduate
As you are, I once was, As I am, You will be.
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