It could just be the SP100...I don't know. I'd like to try the 686+ I showed and perhaps the S&W SSR. The grips on it look like it puts your middle finger knuckle further away from the trigger guard and it's a good looker to boot.
I experienced the same problem with my SP101 in .327 magnum. I just bought a Hogue Monogrip for it which seems to eliminate the problem as fills the gap between the triggerguard and gripframe. My knuckle is not against the triggerguard now. Unfortunately, I don't have any ammo for this thing so I haven't had it back at the range yet.
^^^+1 On my SuperRedHawk I had the same problem. My middle finger felt like someone was hitting it with a hammer. That was with the Ruger factory grips. I installed a Hogue Mono Grip and the problem was gone. AAA for the Hogue Mono Grip..
The rest of the world gets it,why can't we?
"The United States can survive a Barack Obama,who is, after all, merely a fool. It is less likely to survive a multitude of fools such as those who made him their president".
Out of the Czech Republic
I come across that problem as well when I shoot my dad's Model 29 in .44 mag. I think you may just have to concentrate on changing your grip. I found that the trigger guard whaks the top of your knuckle when the gun returns to your normal grip after recoil. Might be something as simple as gripping the gun harder with your off hand wrapped around the outside of the fingers on your right hand (assuming you shoot right handed. Vice versa if not).
I have a S&W 586 (blued model of the 686). I shoot it often and never had that knuckle bumping issue. Several people have shot it and never mentioned that knuckle bumping issue. All I can add is check your grip (not the gips on the pistol, your hand placement).
Those who hammer their guns into plows will plow for those who do not." ~ Thomas Jefferson
Originally Posted by Benning Boy
If you're really bored, I'm your huckleberry. If you really want a challenge, I'm the one.
If you're really smart, you'll just peddle your paint.