Cause and cure , need some suggestions

Discussion in 'CZ Pistol Forums' started by John1125, Sep 17, 2017.

  1. John1125

    John1125 New Member

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    This has happened about 4 times in like 500 rds. Load is 124 grn fmj Flat point by rocky mountain reloading . Loaded with 3.6 grns of titegroup. Length is 1.095 "

    Happened in multiple guns with different mags . None of the mags are new , so I am thinking some extra power mag springs are in order .

    What are the thoughts here ?

    Thank you,\

    Kirk
     
  2. Scarlett_Pistol

    Scarlett_Pistol New Member

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    I'd say some extra power mag springs would help. I clean the mags thoroughly when I get them because that grease they come with is up under the feed lips. Sometimes that causes issues initially or later on with them getting dirty.

    Could be a length issue... You could throat your chamber to take longer rounds. Not a bad mod, SP01Shadow walked me through it and I've done one so far.
     

  3. SPO1SHADOW

    SPO1SHADOW Member

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    I would start with new magazine springs. When you lighten the hammer and recoil springs it increases the slide speed. The magazine has to be able to keep up with this increase by popping up another round quicker that the slide cycles. Looks like your slide may be out running your magazine and with the extra short length you are having to load at all contributes in causing a nose dive in the magazine. As Scarlett said a throating of the barrel so you could load these rounds out a little longer would certainly not hurt anything and may make your gun a little more reliable and easier to load for as a bonus. If you don't have anyone in your area doing the barrel throating you can send it to me. I will do it for you free of charge and offer a one day turn around. Just PM me if you are interested I would be more than glad to help you out.
     
  4. John1125

    John1125 New Member

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    SP01Shadow , that is a very generous offer and I may in fact take you up on that .

    I'm not married to this particular bullet and have some 147 plated coming to just try . I'm sure that the throat issue may show up more with those so I'll let you know , I also have a new barrel coming for this one , and wondered about a finish reamer / chamber length ?

    Also some new mag springs are on the way , the more I looked at this the more I thought it was simply bolt over base , or as you said slide speed faster than mags could present . I have been really playing with the light hammer springs . I have noticed it is not all that easy to shorten up ejection distance with heavier recoil springs as it is to slow things down with a heavier hammer spring .

    On the 1911's I would go with a tight radius on the FPS to slow it down with the best results, don't see that as an option on these cz's especially with the b guns .

    Is there a standard length that you throat these barrels or do you just go off of a pet load?



    thank you ,

    Kirk
     
  5. SPO1SHADOW

    SPO1SHADOW Member

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    I generally go off of a customer's pet load. I have done some really deep ones in the past. I always shoot before and after and to date have never seen accuracy decline or any difference good or bad. Your magazine is really the limiting factor in how long you can load. If a customer does not have a dummy round I use a Hornady HAP loaded to 1.150 as a guide for depth.
     
  6. Earl_Keese

    Earl_Keese Member

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    I've been watching this thread here, and on the "other" forum. Has this ammo ever run flawlessly in the op's CZ's? Or has it been problematic from the start?
     
  7. kashaV

    kashaV New Member

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    first post here.
    If the malfunction happens in several guns and different magazines, it seems obvious it is the ammo, not the gun. Sometimes this can happen with the last round in the magazine catching on the slide stop. A bullet with a more rounded ogive might solve the issue.
     
  8. John1125

    John1125 New Member

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    Earl , they did seem to run for a while with out issue . I have just finished up with 500 of those bullets. And like I said I'm not dedicated to just shooting that particular load/ bullet combo.

    I have some new mag springs installed in 3 of my mags but it has been hotter than blue blazes here and I have been wore out by the end of the days .

    So maybe early tomorrow I can get out and try . It happen very sporadically, about 4- 5 times in 500 rounds .

    If you look at the photo close you'll see that the slide face never engaged the base of the round , it went over the top. I believe its a simple case of bolt over base. The mag is not presenting the round quick enough for the slide to "get hold of it " .

    As I said before I have been running lights springs and changing set ups so often between guns and spring and hammer / sear combos it hard for me to actually keep things straight . (I'm bad about that )

    Kirk
     
  9. SPO1SHADOW

    SPO1SHADOW Member

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    Welcome aboard KashaV! Good advice. We are just a bunch of shade tree gun mechanics here. We like to "diddle with stuff. Sounds like you like to diddle a little yourself.
     
  10. John1125

    John1125 New Member

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    Exactly , my dad used to ask me why do you need to fix it if it aint broke ?


    Kirk
     
  11. John1125

    John1125 New Member

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    New extra power mag springs , 125 rds through this morning with out any feed issue .

    I also fit a new barrel on this one during the week . Here is my first ten rounds . Actually 2 - 5 rd. strings with a sight correction after the first mag.

    15yds 2 handed standing :



    [​IMG]
    [​IMG]
     
  12. Scarlett_Pistol

    Scarlett_Pistol New Member

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    Good to hear it got fixed with the new mag springs. Nice work on the new barrel!