Yes that was something I did to lighten the hammer to get a faster lock time. Theoretically it had to have some effect, but practically it has no noticeable effect that I can tell.What GP100 Hammer is that ? did you modify it yourself ?
However if you can see in the picture where I slimmed down the neck of the spur I find that this really makes for a nice looking hammer. It no longer looks like a utilitarian slab of steel and transforms it into a nicely crafted piece of firearm art.
I used a milling machine with carbide end mill to do the work on the hammer because that is some very hard stainless Ruger uses. But I'm sure a Dremel took with some grinding stones could be used to neck down the spur followed by a buffing wheel and polish to finish it off.