JDJ CZ-527 Light primer strike

[claydunbar]

Hi folks,

I have 2 JDJ cz-527 .300 Whisper. I am experiencing light primer strike on my reloads using CCI benchrest primers. The load is an awesome subsonic load using 220gr rn hornady bullets, and pattern well inside 1". Additionally I have about 5000 rds loaded so Im now fully comitted. I can take the same cartridges that wont fire In the CX 's and put them in my AR upper and they fire. Has anybody experienced this? Does CZ make heavier firing pin springs? I hope someone can help me because I am very frustrated at this point.

Thanks,
Clay Dunbar

[prebancolt]

I know this doesn't answer your question, but I think the CCI primers are not as soft as other primers. I had a similar experience w/CCI primers in other calibers.

I'm sure you can find a stronger replacement spring for the firing pin, though. Just might take some looking.............Wolfe?

J

[keith__davis]

Hey Clay,

Your the third people i have send have the same trouble with the CZ guns, given your shooting my brass i feel compelled to help make this right, couple things if the head space is off just a little the cased would go to fare into the chamber would only take a few thousands, and i think your firing pin spring is ok if it works some of the time, i would thing of setting the shoulder of the firing pin back a few thousnads to let it travel deeper, I can send you a set of headspace gages and have you check headspace very easily done, or chuck up your firing pin and set the shoulder back a few thousands, let me do a little pit of research, I'll get back with you on it.

[DonT]

Clay,

One other item you might check is to disassemble the bolt and remove the firing pin and spring. Get can of brake cleaner or gun scrubber and give it a good cleaning up inside the firing pin channel. It could have just enough junk in it to cause the pin not to extend far enough. I would try this before modifying the pin. Just clean it and they try some primed unloaded rounds in rifle to see if it will set them off.

DonT

[keith__davis]

I looked just for a couple minutes and found these. and i agree with Don cutting on the firing pin is the last thing we want to do.


http://www.benchrest.com/forums/show...850#post281850

http://www.thefiringline.com/forums/...93#post2116793

[claydunbar]

Guys thanks so much. David I will absolutely take you up on the headspace guage offer. Ive been looking for some on the internet and couldn't find any. The perplexing thing is my dad has a JDJ CZ .300 Whisper as well and the same thing is happening there. The gun triggers the ammo 19 times out of 20 but I missed a bobcat this past week because the same thing happened twice in a row. My firing pin has plenty of length but I think a stronger spring may help, I just have no idea where to find that. DonT, I have just put some Wilson Combat Oil lube on the spring and firing pin and fired some primed brass. It worked fine every one I shot but again Ill shoot 20 rds in the field and the 21st will fail, so its a hard test to apply. David, fyi your brass does this significantly less than resized corbon brass. Have no idea why, but it seems your brass is better. Anyway thanks so much to you all and any further direction is much appreciated.

-Clay