Big Shrek
Member
Please post some pics of your frame & slide stops & round count
thru it as a 10mm so we can solve all that "battering" stuff.
Good deals still around. CS 40
- Thread starter raljr1
- Start date
Please post some pics of your frame & slide stops & round count
thru it as a 10mm so we can solve all that "battering" stuff.
JohnHL
Member
Brother colt_saa, thanks for your comment and the opportunity to express my objections to the CS10 conversion.
I am happy to defer to your greater experience in this area as I have not only "failed to re-spring the gun as specified in the various conversion threads here on the Forum", I have completely neglected to make the CS40 to 10mm conversion in its entirety.
Please be assured that I would love to do it because I love multi caliber conversions (I've converted my 40s to 357Sig).
And my efforts with the 357Sig conversion coupled with experiences and observations have persuaded me that the upside of the CS10 conversion is somewhat outweighed by the downside.
My first concern is that S&W never chose to build a 10mm on any alloy frame, much less such a light one. (Yeah, I know. Nobody had ever landed on the moon before. That didn't make it impossible.)
My second concern is the 10mm cartridge itself.
Relative to diameter, it's a long cartridge so a lot of the powder burns outside of the short barrel.
So I'm not so sure there is much of a ballistic advantage.
It also out pressures the the 40s&w round by 3000psi (35k vs. 38k).
But it's not so much the peak pressure but where in the pressure curve that peak comes.
Being a pistol cartridge with fast powder, the pressure peak occurs early in the curve when the pistol is transitioning from locked to unlocked. (Remember the CS40 has no locking lug on the barrel.)
This brings us to the recoil spring you mentioned earlier.
The standard CS40/45 recoil spring is rated at 17 lbs. (by my measurement).
The 1006 spring is 22 lbs. with a heavier (read higher inertia) slide.
Either way, the springs are not at full resistance so early in the recoil cycle.
In my experiments with the 357Sig (40k psi) during unlocking, I found the barrel smacked the alloy frame of a 4003 hard enough to leave a mark even with the 22 lb Wolff recoil spring installed.
I therefore only install my 357Sig barrels on Steel frame pistols like the 4006.
So the requirement for a "shok-buff" to protect the CS40 frame hardly fills me with confidence.
Then there is the issue of the slide rebounding at higher than normal velocities off of the aforementioned recoil buffer and accelerated by the "hyper-spring" back to smash hard into the slide stop.
A common place for cracks to develop on these alloy frames is the thin area above the slide stop shaft hole on the left side of the frame.
My final objection is the relative scarcity of these pistols and their associated components.
The CS40 was produced in the fewest numbers of all the CS models and for the shortest period of time.
And they ain't makin' no more of 'em!
Ream that chamber and that barrel will never be original again.
Rip that spacer out of the magazine, ditto. (Although some quick and dirty testing seems to suggest that CS45 magazines will feed 10mm cartridges.)
Excessively peen or (heaven forbid) crack that frame and the CS40s still out there become even more rare.
Bottom line is, these are your guns.
Modify them how you like.
I envy your CS10.
I simply can't justify the conversion.
John
HCH
Member
Most likely his grieving widow.
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