July 30, 2012, 04:44 PM | #1 |
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CZ 527 American saga
Last year I bought a new CZ 527 American in .223. I was actually looking for an American M1 when the guy in the LGS showed me this particular American Lux - it had an absolutely gorgeous walnut stock and I was smitten.
I was anxious to get it set up for the range and he threw in a used Weaver K6 off of another rifle he had on consignment. Excited, I mounted the scope and trundled off to the range. I had several boxes of factory ammo including some Hornady 55g VMAX. All day, the best group I could muster was about 2 MOA at 100 yards. Frustrated I was sure it was the scope. Switched it to another rifle and it put them right where I pointed 'em. Put it back on the CZ. Over the next 8 months I tried just about every combination of bullet and powder I could think of to see what the rifle liked. I must have run a hundred OCW ladders. All to no avail. Best group it ever shot was about 1.5 MOA at 100. The I was using the Hornady case length gauge and discovered the chamber had an apparently infinite leade. Literally, I could push the bullet three inches past the case mouth without touching the lands. Freaky. Three weeks ago I shipped it off to CZ-USA for warranty IRAN. I got a somewhat cryptic message back that the rifle had "failed the accuracy test." They were going to replace the entire barreled action. I asked them to keep the same stock (which they did) and today I got the new rifle back via FedEx. Mounted the Weaver back on it and off to the range. I was shooting 53 gr Hndy VMAX over 25.7 of 8208XBR at a nominal 3200 fps. Got the scope on a 25 yards and then zeroed at 100. Shot a few 3-shot groups for accuracy and I was pleased, very pleased. Best 3-shot group was .458 outside to outside (.235 ctr-to-ctr)! This is my first CZ and this is the accuracy I had always heard about. I'd love to know what the story was on the original barrel but I don't guess CZ is saying anything more about it. They did all the work under warranty and were a pleasure to deal with.
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July 30, 2012, 04:55 PM | #2 | |
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Quote:
Cheers, C
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July 30, 2012, 04:59 PM | #3 |
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That's weird for certain. Glad they got it fixed fast!
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July 30, 2012, 06:06 PM | #4 |
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Glad it's up and running the way it should!
Welcome to the fold!
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July 30, 2012, 06:13 PM | #5 |
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I understand the CZ barrels are hammer forged. I didn't really understand this process until I did some "research" (I googled cold hammer forging).
What I don't really understand is that after the barrel and chamber are formed around the mandrel, is it then reamed to get the final chamber dimensions? Could this have been a case of a reamer going too far in to the chamber? I would have assumed all this was computer controlled. 10-96, my day job is as a police psychologist - love your ten code.
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July 30, 2012, 06:22 PM | #6 |
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It is as you described Ike. Conventional rough and/or finish chamber reamers are used. I suppose that, somehow, a barrel made it past initial QC that was improperly formed... I just don't see how it could go through several following steps, unseen.
I've heard of cold hammer forging mandrels that include the chamber... talk about your concentricity! But I believe those are very, very rare. Technologies change quickly, so I could be wrong about that these days... but I don't think so. C
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