Author Topic: Tell us how much you like the CZ 527  (Read 7228 times)

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Offline truckjohn

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Re: Tell us how much you like the CZ 527
« Reply #15 on: August 23, 2013, 08:37:27 AM »
As I look at those pix....  Those aren't your standard, garden variety failures... and it looks a whole lot like someone picked some pix of blowups to make the point.....

There have been a number of experiments to determine ultimate strength of actions and barrels.... but to totally split a barrel and action into 5 or 10 pieces - we are talking super duper ultra-overpressure.....  A 2x overpressure won't cause that sort of damage....  Typically, you need an obstructed barrel to do it....

There was a fellow on another forum who went out to destroy a couple actions - just to see what it took.....

Standard cases full of "Normal" rifle powder wouldn't actually do it - the pressure curve tends to build fairly slowly... which means the bullet is already towards the end of the barrel when pressures peak.... which will tend to squirt the bullet out even faster.....  and you get a bunch of unburned powder blowing out the muzzle into a HUGE fireball....

What he finally settled upon was VERY large loads of super fast burning Pistol powder....  Say a standard low pressure cast bullet load would use 8 grains of Unique shotgun powder..... He used 40+ grains of the fastest pistol powders...  THEN - he was able to get failures...  If you run the numbers... This produces an extremely fast rise pressure curve - and would hit somewhere in the vicinity of 200,000+ PSI... or 4x overpressure.... with the bullet 2" down the barrel.....  Even then - it didn't split the action into 50 pieces - it bowed the action out, split the fore-end, and blew the magazine out...

The short story of all of this is that when you see contrived tests to figure out how much abuse it takes to blow up a rifle - you realize that 99%of the time - it's associated with multiple other user-related failures along the way....  (Wrong ammo, Handloads with the wrong powder, stuck a bullet in the barrel, kept shooting..... etc...)

Thanks

Offline bobanddog

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Re: Tell us how much you like the CZ 527
« Reply #16 on: August 23, 2013, 10:35:21 AM »
I have seen some threads about experimenting with intentionally causing catastrophic failures to happen; sort of like the 'Mythbusters' approach of "now that we've busted the myth, we're going to see what it takes to actually make it happen".  They can be entertaining and enlightening.  Those images I posted were all of SAKO and TIKKA rifles, which in fact were at least partially recalled after a series of catastrophic failures, some involving injuries: http://www.hs.fi/english/article/1101978285825
By the way, almost every account I read involved factory ammunition.

Yes, I was trying to make a point, to emphasize what can happen when a rifle with a high-tech (cost saving) investment cast receiver fails catastrophically.  I can't stand this concept that the receiver can be made of lesser materials or processes because 'all the pressure occurs in the chamber of the barrel'...  I'm sorry, but if the barrel fails for whatever reason, all the way back to the threads, I want a receiver built with a better chance of containing it, rather than contributing to the shrapnel.

By the way, I was once the proud owner of an old SAKO L61 Finnbear, back when they were built like Bofors cannons.  I would have no qualms against shooting one of those anytime.  But I don't like the way they build their 'new and improved' rifles.
"I have laid aside business, and gone a'fishing."

Izaak Walton

Offline SerenityNetworks

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Re: Tell us how much you like the CZ 527
« Reply #17 on: August 23, 2013, 06:18:54 PM »
If the question is still out there about how much I like the 527 then I'll pitch in.  My 527 Varmint in .204 Ruger is the queen of my harem.  She has around 150 rounds through her and the performance has been flawless.  I'm getting pretty reliable at 'calling the shot'.  I've not yet had a shot within 200 yards that fell outside 1 MOA where I did not know it was my fault.  If the rifle has cold bore fliers then they fall inside my level of ability, because I cannot detect them as fliers.  At 300 yards I'm shooting a little over 1 MOA and at 400 yards I'm shooting a little less than 2 MOA.  I attribute that to my near total lack of ability to dope the wind.  I love the trigger, the bolt is smooth, and my sight (scope) picture is naturally perfect (that is I don't need to add a cheek riser, move my head around, or anything).  The rifle remains totally stock.  It's that rifle that got me hooked on CZs.

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Offline sirgilligan

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Re: Tell us how much you like the CZ 527
« Reply #18 on: August 23, 2013, 11:26:44 PM »
Thanks. What scope do you have?


If the question is still out there about how much I like the 527 then I'll pitch in.  My 527 Varmint in .204 Ruger is the queen of my harem.  She has around 150 rounds through her and the performance has been flawless.  I'm getting pretty reliable at 'calling the shot'.  I've not yet had a shot within 200 yards that fell outside 1 MOA where I did not know it was my fault.  If the rifle has cold bore fliers then they fall inside my level of ability, because I cannot detect them as fliers.  At 300 yards I'm shooting a little over 1 MOA and at 400 yards I'm shooting a little less than 2 MOA.  I attribute that to my near total lack of ability to dope the wind.  I love the trigger, the bolt is smooth, and my sight (scope) picture is naturally perfect (that is I don't need to add a cheek riser, move my head around, or anything).  The rifle remains totally stock.  It's that rifle that got me hooked on CZs.

-----------------
Feel free to visit my personal fishing, shooting, hunting, and reloading information web site:  http://www.fshrmen.net/



Offline SerenityNetworks

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Re: Re: Tell us how much you like the CZ 527
« Reply #19 on: August 24, 2013, 01:04:20 AM »
Thanks. What scope do you have?
The Vortex Viper 6.5-20x44 PA with BDC reticle.  (I prefer holdover to twisting turrets.) It sits on a DIP rail/mount in Burris Signature-Zee rings.  I absolutely love it.  I've compared it side-by-side to several Leupolds now and I am unable to tell any difference in clarity.  It blows my Nikon Prostaff away.  I got it from Gander Mountain's web site for $300.  It is selling for more now, but I understand CameraLandNY will be having them on sale for $280 (including shipping) again sometime in December.

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Feel free to visit my personal fishing, shooting, hunting, and reloading information web site:  http://www.fshrmen.net/

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There are some ideas so preposterous that only an intellectual will believe them. - Malcolm Muggeridge

Offline atn729

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Re: Tell us how much you like the CZ 527
« Reply #20 on: August 29, 2013, 01:43:51 PM »
I have a cz 527 carbine in 7.62x39. I picked it up last friday and shot about 400 rounds through it over the weekend. It is one of the most fun guns I have ever had the pleasure to fire. It ate everything I fed it and then asked for seconds. It is a high quality firearm for a lower quality price. I can not conceptualize a rifle being more perfect for my purposes.

People say that 7.62x39 is an inaccurate cartridges but I am averaging 4.27 cm at 100 meters which is quite good for the ammunition I was using (wolf and tula). I am working up reloads for hunting right now and I can say with certainty that my rifle will be a sub MOA gun.

Offline SWE1975

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Re: Tell us how much you like the CZ 527
« Reply #21 on: August 29, 2013, 03:29:32 PM »
I have an American chambered in 221 Fireball and an FS chambered in 22 Hornet.  Neither of them are going anywhere  ;)

Offline SWE1975

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Re: Tell us how much you like the CZ 527
« Reply #22 on: September 03, 2013, 03:31:14 PM »
Well Guys,

Up top is the hornet followed by a couple targets shot today. I think I've found a winner. Below is my Fireball. Needless to say I am rather happy and excited to see what hand-loads will do in the Fireball!

Take Care,
Scott