I just joined the BRNO ZKK 602 Owners Club

Discussion in '.375 & Up' started by Shootist43, Aug 20, 2019.

  1. Foxi

    Foxi AH Elite

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    Sorry, I didn't mean to offend anybody, but I have one myself, and when I compare...........................................
     
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  2. One Day...

    One Day... GOLD SUPPORTER AH Fanatic

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    CZ 550 energizer bunny.JPG

    So, let us recapitulate about the CZ 550 / ZKK 602 (they are the same action):
    • Magnum length action (try to chamber a .416 Rigby or .505 Gibbs in a Winchester 70!)
    • Double square bridge with integral scope base machined in the action (try to weld a double square bridge on a Win 70!)
    • Forged steel, machined action (as opposed to powder steel lost wax cast action)
    • Controlled round feed and Mauser extractor (at least the Win 70 copied that (y))
    • Machined steel, drop-belly bottom (compared to 'pot steel' cast bottom in Win 70; will not crack when torqued properly)
    • 5 + 1 capacity with H&H family of cartridges; 4 + 1 with Rigby (try that with a Win 70!)
    • Integral rear sight base machined in the barrel (will never fall off like a base screwed on the barrel; oh yes they do...)
    • Barrel band front sight (will never fall off like a front sight screwed on the barrel; oh yes they do...)
    • Weight appropriate to caliber
    • Factory chambered to .416 Rigby, .458 Lott, .505 Gibbs, etc.
    • Bolt-mounted firing pin-blocking safety easy retrofit (Gentry, Lapour, AHR)
    • Direct trigger easy easy retrofit (Timney, AHR)
    • Kevlar, full length aluminum bedding block stock easy retrofit (Bell & Carlson)
    • Oh, yes, let us not forget: affordable ($1,200)...
    So yes, on some CZ 550 factory runs (not all, by far) a few machining burrs may need to be removed here or there (ZKK 602 were deburred at the factory, I wish they had continued that :V Spank:); the action needs to be cycled a couple thousand times to smooth it up; and the feeding rails need to be mirror polished for the rifle to become DG worthy and 100% reliable, but if anyone out there is naive enough to think that they can unpack a Winchester 70, Remington 700, Ruger 77, Sako 85, etc. load it up, and go track a wounded buff, they are thoroughly out of touch with reality :V Shot:

    ALL large caliber DG rifles need to be tuned up...:S Please:

    Do not get me wrong, I love the Win 70 (I own three) but they are not exempt from factory mishaps. For example, the safety could not be engaged on my limited series Classic Stainless, New Haven made, .300 Wby. Had to take it apart and bevel the engagement camming surface. So here goes for me the legend of the Win 70 ready to hunt from the box... :S Sorry:

    Also, let me share a dirty secret: do you know why the Win 70 is so "smooth" from the factory? It is simply because the rear bridge is machined with much wider tolerances. Yep, there is a lot of free space for that bolt to wiggle bag & forth. The Win 70 bolt is not smooth, it is loose :E Rofl:. The CZ bolt is initially stiff because the rear bridge tolerances are much tighter, hence the need for a break-in period. So what!

    A $1,200 CZ 550 with a few hours of TLC is the full functional equivalent to a $15,000 double square bridge Mauser/Rigby. Take it anyway you want, a Win 70, Rem 700, Sako 85, Ruger 77, etc. will never be that, period, and THAT is the reason why they are so loved in Africa. The fact that they are insanely cheap does not hurt either, of course...

    Anyway, :S Beat Dead Horse:

    In the end, to each his own :A Surrender:

    My speculation is that the day is not far when the machine-tools will wear out at CZ and the 550 will be gone. Let's see how fast they acquire the cult status that the ZKK 602 enjoys today...
     
    Last edited: Sep 11, 2019
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  3. Shootist43

    Shootist43 AH ENABLER GOLD SUPPORTER AH Legend

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    Foxi, no offence was taken. As you so eloquently pointed out, it isn't the prettiest rifle I've ever seen.

    One Day, so …. that is why I bought that rifle!!
     
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  4. bruce moulds

    bruce moulds AH Elite

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    hoss,
    that 458 win question has been addressed, and it turned out to be a projection in the magazine hitting a primer.
    possibly not made by brno that way who knows?
    if it was brno, they should have known better as it was certainly not fit for purpose.
    bruce.
     

  5. Pondoro

    Pondoro AH Fanatic

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    Bruce...it was made that way..the magazine box was 100% stock….and they should never have chambered the .458Win. in that cavernous action, though I guess the market demanded it back then...before the revival of .416 Rigby, .500 Jeff etc.. One of the few failures of Brno perhaps..

    I am using the action of the same rifle to make a .500 Jeff (If my gunsmith EVER find time to do so...:eek: ).
     

  6. bruce moulds

    bruce moulds AH Elite

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    so brno made a bad mistake.
    no magazine should have a projection like that.
    if it could set off a 458, it could also set off a 375.
    you can't blame the cartridge for that.
    bruce.
     

  7. Pondoro

    Pondoro AH Fanatic

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    Well...I have heard of other similar experiences with .458 in a 602 but never in a .375H&H. The .375´s do not move much in the magazine on these rifles..

    Bottom line is that they should never chambered the .458 in these rifles without altering the mag box....in addition to what happened to me the rounds fly back and forth in the mag to the extent that bullets are driven back in the case..not good...but .458 was more or less the only large bore round available during the 70-80´s when these rifles were made..
     

  8. Pheroze

    Pheroze AH ENABLER AH Legend

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    Does the extra length of the Lott eliminate this issue?
     

  9. Shootist43

    Shootist43 AH ENABLER GOLD SUPPORTER AH Legend

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    After this incident did BRNO do anything to change or modify the magazine box? Was this a one off incident where the magazine wasn't properly deburred? If not, did BRNO issue a safety warning or a recall of any sort?
     

  10. TOBY458

    TOBY458 AH Elite

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    Just to keep things on the up and up, Winchester 70 actions and bottom metal are forged, not cast. Ruger is cast. Sako 85 is Cast. Montana Rifle is cast. But not Winchester. Most people would never believe Sako uses a cast action, because they actually take the time to machine away the rough parts. Either way, I don't know if cast is inferior to forging, but those are the facts.
     
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  11. Milan

    Milan AH Enthusiast

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    I think so. I think the 602/550 magnum are best matched to this round. Long, yet slimmer than 416 rigby cased cartridges, so you can still have 5+1, yet the length matches the magazine box and action lengths better. Just like 30-06 on the medium ones.
     
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  12. Milan

    Milan AH Enthusiast

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    This must have been a "one of". Deburring was not high on their list at Brno during commie times. The main issue with metal finish not matching that of say Sakos, was more the fact that they would run their tooling longer to save money (or they did not care). I.e. no money/time/effort put into sharpening or replacing the tools more often. Also less hand fitting after the fact than in the earlier days. If you got one of the rifles done by fresh tools, it was probably one of the smoothest "Mausers" you could get. Even back then. Anything towards the end of the run looked like crap.

    I had one mod 600 in 7x57 that had a firing pin that was not completely machined off at the tip. It punctured the primer and blew some powder in my face. This one also had the test target but it was clearly punched with a hole puncher rather than actual bullets at test facility (lazy technician/human). One should completely check the rifle before first firing it, I guess. Luckily the bolt shroud and gas vents did their job and I did not suffer any damage. I sanded the tip of the firing pin to proper shape and no problem from there on. It was the only Brno/CZ I ever came across that had an actual flaw from the factory. This is not to say I do not believe the others.

    On a side note, all actions become smoother with use. Mauser style ones, just always happen to be stiffer than push feed regardless. One of the smoothest Mausers I tried was a Heym (the newer Martini style).
     

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