William
I have a pair on my 4 inch 629. Yes, they are slimmer then factory targets. They feel good to me, just a little different. Very well made, and a perfect fit. I have average length fingers, but big hands, and wear a size 20 ring. If you want the exact same feel as factory, you might want to look for a pair on this site, or ebay / gunbroker. Eagle grips makes a model that are supposed to replicate the factory target "coke" style, but I have not tried them. People also speak highly of the factory targets available from S&W they are using on some of their retro revolvers, and they are only about $60.00 I believe, but they are checkered only. I once had a beautiful pair of smooth targets that came on a S&W 27 I once owned. They were blond color, with dark swirls. Like an idiot, I gave them to a friend after replacing them with a set of rubber grips as I was carrying it as a duty gun at the time.
Larry