CZ SP01 shadow question...

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ruger22

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I have a CZ SP01 shadow.
I reload with win SP primers.
I get occasional light hits on the primer resulting in no fire.
About 1 in every 100 rounds.

Could this be how I operate the trigger?

Or a spring issue?
 
It is not a trigger issue. Are you sure the primers are being seated to the bottom of the primer pocket? Have you changed to a lighter mainspring?
 
Thats interesting that you mentioned this. My Shadow is doing the same thing. I use Winchester primers as well with a Lee 1000 press. The primers are all set flush. My failure rate is much higher like 1 in 20. I thought I had a batch of contaminated primers. I just reloaded another 50 for the range tomorrow so will see.

I just checked Lymans 47 Ed. and it calls for case lengths of .754. I just miked about 30 cases of once fired that I saved from my case of 9mm that I bought and I'm getting .742 to .745. How do you explain that? That, I expect, is the cause of the light stikes as the case is too short. How can that be?
 
primers?
Winchester SP

Lighter spring?
Yes but I want to be sure light primer hits cannot be poor trigger control.

primer seating?
I believe they are seated correctly.


thanks...
 
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Mr AR15 said:
I just checked Lymans 47 Ed. and it calls for case lengths of .754. I just miked about 30 cases of once fired that I saved from my case of 9mm that I bought and I'm getting .742 to .745. How do you explain that? That, I expect, is the cause of the light stikes as the case is too short. How can that be?
Click to expand...

Pistol cases get shorter after firing and sizing. They tend to fatten up at the ass end.

All theory aside, most pistols wind up headspacing on the extractor. Wild variations in case length do nothing to promote accuracy, but generally don't affect reliability. The biggest problem is inconsistant mouth crimp.
 
ruger22 said:
primers?
Winchester SP

Lighter spring?
Yes but I want to be sure light primer hits cannot be poor trigger control.

primer seating?
I believe they are seated correctly.


thanks...
Click to expand...
Again it is not trigger control problem. If the primers are seated correctly, try switching to Federal primers as suggested. If you still have a problem, go the next higher mainspring weight. I use a 15# spring in my SP-01 and had no issues with primer ignition. A 16# spring will ignite all primers, even so called 'hard' primers. Keep us posted.
 
thanks for the info...

I have just cracked my last case of 5K win SP primers.
So I stay with the win primers for now.

I have installed on the gun a 13# spring.
I have a new 15# waiting to go.;)
I will make the change.

Switching from win LP primers to Federal primers cured the light hit problem on my tuned smith 625 revolver.

The reason I asked about trigger control was cause it "seemed" to act up more when I was practicing DA draws.
 
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I think you will find your problem will go away with the 15# spring. When and if you switch to Federal primers, try the 13# spring again. Cheers.
 
No its not a problem with the standard main spring that comes with the gun. Some people install a lighter main spring to lighten the DA trigger pull.
 
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Friend who shoots with us in IDPA has an M&P with light strike issues. They go bang in my gun but not his consistantly. So far it has happened with Reminton and Winchester primers as well as some factory. Will load some Federal primed cases and see if that helps.

Take Care

Bob
 
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