Shadow 2 spring?

[Roscoe2212]

I have not found a source that lists the OEM spring # for a Shadow 2.  For most out of the box full size, it is 17#,
according to CGW's tutorial.
I changed the spring in my97B to 13# and got really good results with my soft loads, and not a huge ejection distance from hardball ammo.
Thus I figure I might try  a lower power spring on the shadow for my soft loads, as it doesn't really like them
with the factory spring.  It would be helpful to know what that is.

[2morechains]

I don’t know what the stock recoil spring is, but I run a 10 lb recoil spring shooting 130 PF ammo. 

[Tok36]

From Reply #41 in the thread linked below.

"S-2 hammer spring wire OD = .042" which equates to a 14 - 14.5 lb. hammer spring
S-2 recoil spring wire OD = .042" which equates to 13#'s
Firing pin spring wire OD - .029" which equates to OEM
Firing pin length = .2.468" which equates to OEM
S-2 Disco down leg center thickness dimension is .125"
"

From Reply #52 in the thread linked below.

"Recoil springs and hammer springs are the same for the "old" Shadow vs the S-2"

Critical Look at the Shadow 2
https://czfirearms.us/index.php?topic=86823.0

Edit: Looks like 17LB is more likely.

[Hawker800]

I got this reply from the factory.

[Roscoe2212]

Thanks, much like I expected, 17#  I guess they have to anticipate super power loads so somebody doesn't break a new gun.

[Fuzzy Sights]

S2 is build for competition and may competitors use major power factor loads.  CZ builds their pistols for that purpose.  My S2 came with extra springs of different colors, blue and yellow as I recall and three slide stops.  Have never used them.

JW

[George16]

S2 is build for competition and may competitors use major power factor loads.  CZ builds their pistols for that purpose.  My S2 came with extra springs of different colors, blue and yellow as I recall and three slide stops.  Have never used them.

JW

You don’t use major power factor loads with a shadow 2. It’s setup for shooting minor or NATO but not major PF at 160 (IPSC)/165(USPSA). You’ll break the gun with major PF loads.

The only 9mm CZ setup for major PF is the czechmate with the compensated barrel.

I’m using 10# recoil spring on my shadow 2 shooting 130-132 PF rounds for USPSA.

[Fuzzy Sights]

Have a couple of loads that are not out of SAMMI spec that will get you 160 PF, these were standard pressure loads, not +P.  With my S2 you would need to lengthen the throat a little as it will not let me seat a 147gr XTP bullet out that long (ker-plunk test failure).  Not shoot USPSA myself, the experiments were only to see what is possible. Getting 1150 fps was not difficult in a SIG 226 with a Bar-Sto barrel or a CZ 75B SA, which had longer throats.

Hope this helps.

JW

[George16]

Have a couple of loads that are not out of SAMMI spec that will get you 160 PF, these were standard pressure loads, not +P.  With my S2 you would need to lengthen the throat a little as it will not let me seat a 147gr XTP bullet out that long (ker-plunk test failure).  Not shoot USPSA myself, the experiments were only to see what is possible. Getting 1150 fps was not difficult in a SIG 226 with a Bar-Sto barrel or a CZ 75B SA, which had longer throats.

Hope this helps.

JW

Look, I’m not going to get into a back and forth with you on this. Go ahead and shoot 1150 FPS with 147 Gr bullets your shadow 2 as you see fit but the gun wasn’t design for Major power factor. To what point are you going to use your 1150 FPS 147 Gr ammo?

I shoot open division with my czechmate. I had both barrels reamed to accept up to 1.175” OAL. I reload using 124 JHP bullets with Aa7 and Shooter world major Pistol at 1.165” OAL  to get 171 PF. There’s a reason the compensator was necessary for the czechmate when configured for open. It is to dissipate majority of the gasses through it (minimize muzzle movement) so it won’t damage the gun over time compared to a non-compensated setup like you’re doing on your shadow 2 or 226.

Here are my pistols for USPSA.


By the way, what powder are you using to get 1150 FPS with you 147 Gr XTPs?

[Fuzzy Sights]

VV N350 and N105.  The 350 load showed the least extreme spread as long as you use a magnum primer.  By the way if you make a change like this, you need to back to a starting load and work up again.  This load was one of those loads you needed to go back to the beginning.  Pressure signs showed up at .3ths below max (on the case first, just ahead of the web).  Confident that a lesser gun would not have contained the max published load.  Believe that I got slightly higher velocities due to the SIG and 75 having 3/4in longer barrels, and without any pressure signs on the case or primer.

Was thinking of using this as a Pig hunting load.  Decided to use a 357 Sig load instead as I could drive the same bullet to almost 1400 fps.  Though that pistol has a 5.2 inch barrel.

Lots of competitors use this and other major loads in their S2s.  Agree that the guns will wear out faster, but they choose to do so none the less.  The ones that do this with CZs do not scare me as much as the Glock and the Glock Clones. 

Hope this helps.

JW

[tdogg]

Thread drift:

Max load velocity published by Vihtavouri is 1070 fps for the 147gr XTP and N350 powder combo.  I'm not sure where you are getting your "published" data but I'd reevaluate your sources.

I'm not sure who your competing with that loads major in an S2 on purpose but it's unsafe for them and folks around them.  The S2 is a purpose build production gun, it isn't designed to run major PF ammo and there is zero competitive advantage doing so.

/drift

Cheers,
Toby

[George16]

Thread drift.

Agree with Toby. There’s no way N105 and 350 are safe at those loads with the 147 XTPs. It’s too unsafe for the gun and shooter using those loads.

By the way, I had been shooting USPSA for awhile now (at least 3-4 times a month) and I still have to see a competitor use major loads on their shadow 2. Which club or area do you shoot at? I may know some of those competitors you’re talking about and ask them about their major loads for the shadow 2.

The guys that do this with their CZs won’t scare you because there’s none of them stupid enough to shoot major loads on a shadow 2 unless it’s modified with a compensator. The competitors you’re talking about might have told you they’re shooting in open division but didn’t elaborate to you that they’re shooting open division with minor loads (minor scoring ) so they can stuff as many rounds as they can into their mags instead of just 10 for production or 23 for carry optics.

I still call this bullbleep.

/drift over.

[SoCal]

This is data copied from VV 2017, 2020 and 2021 handloading guide.

9,5  147  HP/XTP Hornady 29,0 1.142

3N37    0,30 4.7 298 979    0,33 5.1      321 1052
N350    0,29 4.5 302 991    0,32 5.0    326 1070
3N38    0,41 6.3 357 1171    0,45 6.9    368 1207
N105    0,40 6.1 317 1039    0,41 6.4    338 1108

PF for max loads for N105 is 162.876 and 3N38 is 177.429  so there is published data from VV for 106+ PF without exceeding SAMMI specs.
Both 3N37 and N350 fall just short of 160 PF.

Would make acceptable pig hunting (NOT THE BEST) loads.