Wiley Clapp GP100 10mm Revolver

[gtrmkr]

I ordered a Wiley Clapp GP100 10mm revolver. Can I also shoot .40 S&W rounds out of this revolver? I heard on youtube that it will not shoot .40 S&W rounds just 10mm and I thought that was strange.

 

[contender]

I have a Match Champion in 10mm/40 S&W. I haven't paid much attention to the Wiley Clapp model. What does the Ruger factory site say about it? Mine says it'll shoot both. (And it does.)

 

[CraigC]

The issue here is the two cartridges have different extractor grooves and require two different moon clips. I use those from TK Custom, .032" for the 10mm and .040" for the .40S&W.

 

[rangerbob]

My 10 mm Match Champion shoots either with the factory moon clips. I wonder how the 10mm and 40 both use the same shellholder on all of my presses. Bob!!

 

[contender]

I use Ranch Products moon clips & they work fine in my MC AND my S&W. I just ordered more Ranch moons for my LCR 9mm, and my MC while at SHOT.

 

[BPGuy]

Short answer: Yes. There isn't any reason you can't shoot .40 S&W in this gun. Just be advised you may have to scrub the chambers thoroughly to ensure 10mm will easily chamber.

 

[gtrmkr]

Well I got the revolver and sent it to Mag Na Port and just got it back. I loaded 25 moon clips up with .40 S&W and out of 150 rounds, 26 of the 40's failed to fire with the standard moon clips that come with the GP100 and that Ruger sells for the GP100. I then loaded up 25 more moon clips with 10mm and all 150 rounds fired with the 10mm ammo. So the .40's will fire most of the time but I will not carry the gun with .40's as they are not 100% reliable like the 10mm rounds are. I will shoot the gun for fun with the 40's. Thanks for all who replied to my original post. God Bless.

 

[mustang99]

The issue is that Ruger marketing decided that people should be able to shoot the 10mm/40sw round without moonclips. And even though this is actually impossible to produce reliably they persisted. So instead of headspacing off the moon clip, like s&w does on theirs, you get this. I would try making moonclips of different thickness that you use caliber specific.