Question about Wolff Magazine springs

[WorkingStiff]

Are the AT-84, CZ-75, TZ-75, P-9 - Standard & Longslides
Wolff +10 springs the recommended ones to replace CZ/Mec-Gar mag springs for the CZ97?

[jwc007]

Full Size CZ75's, TZ75's, AT84's, EAA Witnesses (all Calibers), and the CZ97B all use the same basic Magazine Spring Design.  Normally, I would recommend the +5% as the +10% springs may be too stiff, but the +10% may have more life in them.

Also consider the new Chrome Silicon Magazine Springs from ISMI.  They are not on the Website yet, so you have to call to order.

www.ismi-gunsprings.com/

[CZ75BSA]

I just received my "+10%" springs from Wolff.
They come with a little warning sticker that says "+15% for CZ-75".
Anyway, they FEEL like about +50% compared to the stock 97B springs.
But I was able to load all my mags without a mag loader.  I DO have a sore thumb now, though !

They feel about right to me.  Most of my other pistols require some effort to load the mags.

Range report to follow....

[jwc007]

Currently, I am using the +5% Wolff magazine Springs in my magazines for my .45 Witness, which uses the same Mec-Gar magazine as the CZ97B. While they work well for the most part, I still get the occasional plunging jam.  This only happens when I am shooting Rapid Fire and with my Flat Pointed IPSC Match loading. I have considered the +10% Wolff magazine Spring as well as other magazine mods to cure this from happening.  I do remember that when my Mec-Gar magazines were new that they were difficult to load and I loaded them fully with the help of a Magazine Loader and left them loaded for a week.  That took a lot of the pressure out of them and they could then be loaded by hand.  Later I went to the Wolff +5% Springs.

I have also used the +10% Wolff magazine Springs in another pistol and when installed, could hardly load, without the help of a Magazine loader.  Some 4 years later now, they have worn in nicely and can be loaded a bit by hand, but I still prefer to use a magazine loader with them.

[CZ75BSA]

I tried out the "+10%" springs today.  I have 6 magazines, and shot about 300 rounds.  200 of the rounds were Reminton 185 JHP, 50 Rounds of Cor-Bon 200 gr +P, and 50 rounds of Federal American Eagle 230 gr. ball ammo.

The springs worked well in all mags, and the action of the pistol seemed a bit crisper and snappier.  But sadly, it did not solve the problem of feeding hollow points. I probably had a total of about 6 rounds do the typical "nose dive" into the feed ramp and stick there.  

It was not related to a specific magazine, and happened to both the the Rem and CoBon. (The hardball, was, of course, 100% reliable)  

For the record, two of my mags are factory, and 4 are Witness mags by Mec-Gar that are identical to factory.  For whatever reason, my mags do not have an excessive play or gap at the bottom; they seem to sit at the proper height and have a normal (very slight) amount of play, typical of good factory tolerances.
The only mitigating factor might be that I have not cleaned the pistol for about 300 rounds before starting the day, and the reliability seemed to get worse as the number of rounds (and dirt) increased.

At this point I think I will give up on standard design hollow points and stick with hardball or expertiment with the "powerball" ammo I have heard about.

the 97B spits out hardball so smoothly that I will still love the pistol even with that limitation.

[Mindsink]

Easiest thing to do is call up CZ-USA and speak with a smith. Tell them that hp's are not feeding properly. See what they recommend. They may have you send the gun inn to correct the issue.