CZ527 carbine 7.62x39

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Re: CZ527 carbine 7.62x39

Post by Milsurp98 » 28 Jun 2017, 9:30 pm

Straight from the CZ web site: http://cz-usa.com/product/cz-527-carbine-223-rem/
Built to CIP specifications, our 7.62×39 chambers are ideal for shooting steel-cased surplus ammo. Designed to shoot .311 bullets, some American brass ammo may not perform as well as the imported steel-cased variety because of SAAMI brass dimensions and varying bullet diameters.

Our .223s will happily eat 5.56, since CIP doesn’t differentiate between the two cartridges and just has the higher pressure as its standard. So our .223s will shoot everything from the cheapest Russian steel to match .223 brass ammo.
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Re: CZ527 carbine 7.62x39

Post by SHV » 28 Jun 2017, 10:10 pm

Milsurp98 wrote:Straight from the CZ web site: http://cz-usa.com/product/cz-527-carbine-223-rem/
Built to CIP specifications, our 7.62×39 chambers are ideal for shooting steel-cased surplus ammo. Designed to shoot .311 bullets, some American brass ammo may not perform as well as the imported steel-cased variety because of SAAMI brass dimensions and varying bullet diameters.

Our .223s will happily eat 5.56, since CIP doesn’t differentiate between the two cartridges and just has the higher pressure as its standard. So our .223s will shoot everything from the cheapest Russian steel to match .223 brass ammo.


I believe the main thing is the bullet size, 311 or 308, CZ527 carbine designed for 311, some commercial 7.62x39 ammo got the 308 projectile so the accuracy is not good ...
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Re: CZ527 carbine 7.62x39

Post by jovialjosie2002 » 01 Jul 2017, 7:18 pm

I have one of these rifles in 7.62x39 and it's horrible. It's been back to Winchester 3 times already. I have only shot about 150 rounds through it. Mine does not like milsurp ammo at all. In fact, milsurp ammo broke the extractor. There are heaps of these guns second hand in gunshops....Ask yourself why???? Just look at how many are for sale on any internet second hand gun sales site. This is the worst gun I have ever bought.....It's looks beautiful, however, it's just not reliable.
http://www.ozgunsales.com/searchresults ... &x=14&y=14
Most of these are second hand, AND not very old....Not a good sign when everyone is selling them.
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Re: CZ527 carbine 7.62x39

Post by SHV » 08 Jul 2017, 11:49 pm

thanks Milsurp98, got the first batch reload try to find sweet point(s)

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Re: CZ527 carbine 7.62x39

Post by SHV » 08 Jul 2017, 11:51 pm

just came back from St Marys, 3 shot each group at 50 meters

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Re: CZ527 carbine 7.62x39

Post by SHV » 08 Jul 2017, 11:54 pm

looks like 27.4 , 28.2-28.4 and maybe 28.8 gr groups got better accuracy, next time may try these 3 group 5 shot to find out
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Re: CZ527 carbine 7.62x39

Post by Gwion » 09 Jul 2017, 7:22 am

I'd personally just load up 15 at 28.3 and confirm with 3 groups of 5. Looks consistent through that range where as other loads spread on either side, if that makes sense. This should give you a little leeway for changes in conditions or 0.2 grain variation in charge.
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Re: CZ527 carbine 7.62x39

Post by Dexer » 09 Jul 2017, 10:03 am

Looks brilliant.

Can you see the front sight through the scope? I had that on a rifle once and found it really distracting.

I do love these firearms...
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Re: CZ527 carbine 7.62x39

Post by SHV » 09 Jul 2017, 8:06 pm

Gwion wrote:I'd personally just load up 15 at 28.3 and confirm with 3 groups of 5. Looks consistent through that range where as other loads spread on either side, if that makes sense. This should give you a little leeway for changes in conditions or 0.2 grain variation in charge.


good idea, will try, thanks
also will try trail boss, I don't know why the reloads drop few cm compares to the factory ammo and looks like it stay there no matter how much powder loaded, maybe it is due to the different projectile or maybe the 8208 burning rate is too slow for the 7.62x39, especially for the sort barrel carbine?
Last edited by SHV on 09 Jul 2017, 8:13 pm, edited 1 time in total.
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Re: CZ527 carbine 7.62x39

Post by SHV » 09 Jul 2017, 8:08 pm

Dexer wrote:Looks brilliant.

Can you see the front sight through the scope? I had that on a rifle once and found it really distracting.

I do love these firearms...


thanks

low power (2x) yes you can see the front sight
high power (7x) can not see it or it is not that easy to see...
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Re: CZ527 carbine 7.62x39

Post by Milsurp98 » 09 Jul 2017, 8:30 pm

SHV wrote:
Gwion wrote:I'd personally just load up 15 at 28.3 and confirm with 3 groups of 5. Looks consistent through that range where as other loads spread on either side, if that makes sense. This should give you a little leeway for changes in conditions or 0.2 grain variation in charge.


good idea, will try, thanks
also will try trail boss, I don't know why the reloads drop few cm compares to the factory ammo and looks like it stay there no matter how much powder loaded, maybe it is due to the different projectile or maybe the 8208 burning rate is too slow for the 7.62x39, especially for the sort barrel carbine?


Try AR2207. 8208 is not even listed in my manuals or the ADI website.
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Re: CZ527 carbine 7.62x39

Post by Gwion » 09 Jul 2017, 8:41 pm

I wouldn't be too worried anout that different POI. As lol Ng as it is consistent and you can learn its drops. If it is s concern, as above, try a different powder.
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Re: CZ527 carbine 7.62x39

Post by SHV » 09 Jul 2017, 9:27 pm

Gwion wrote:I wouldn't be too worried anout that different POI. As lol Ng as it is consistent and you can learn its drops. If it is s concern, as above, try a different powder.

do you think TB will be a good idea for 7.92x39? this rifle is just for short/light, low recoil, mild ammo 30 cal, for hard hitting and long range I've got 308 A7 and 30-06 battue :lol:
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Re: CZ527 carbine 7.62x39

Post by Gwion » 09 Jul 2017, 9:43 pm

Dunno. Try it and find out. What would you use the TB loads for?
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Re: CZ527 carbine 7.62x39

Post by SHV » 09 Jul 2017, 10:23 pm

Gwion wrote:Dunno. Try it and find out. What would you use the TB loads for?

plinking maybe :lol: TB223 probably for 100 meter rabbits, BT 762x39 maybe for anything not dangerous :lol: :lol: :lol:
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Re: CZ527 carbine 7.62x39

Post by in2anity » 10 Jul 2017, 12:23 pm

SHV wrote:also will try trail boss, I don't know why the reloads drop few cm compares to the factory ammo and looks like it stay there no matter how much powder loaded, maybe it is due to the different projectile or maybe the 8208 burning rate is too slow for the 7.62x39, especially for the sort barrel carbine?


Factory powder is mystical magical stuff - FWIW my 30/30 seems to boot a lot harder with factory ammo compared to (MAX) handloads of a variety of powders (i.e. 2208,2207,2206), I always wondered why...

Trail boss will be perfectly safe mate, just don't compress it. Give it a go and post your results; I'd love to see how she handles it! If it's accurate, it'll be capable of taking down bigger game than rabbits...
At what point does lack of maintenance become patina?
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Re: CZ527 carbine 7.62x39

Post by SHV » 10 Jul 2017, 4:19 pm

in2anity wrote:
SHV wrote:also will try trail boss, I don't know why the reloads drop few cm compares to the factory ammo and looks like it stay there no matter how much powder loaded, maybe it is due to the different projectile or maybe the 8208 burning rate is too slow for the 7.62x39, especially for the sort barrel carbine?


Factory powder is mystical magical stuff - FWIW my 30/30 seems to boot a lot harder with factory ammo compared to (MAX) handloads of a variety of powders (i.e. 2208,2207,2206), I always wondered why...

Trail boss will be perfectly safe mate, just don't compress it. Give it a go and post your results; I'd love to see how she handles it! If it's accurate, it'll be capable of taking down bigger game than rabbits...


will update once get chance to try, full capacity for 762x39 case is 10.0 Gr TB, I‘ll try 8.8---9.1---9.4---9.7---10.0’ these 5 groups, best accuracy should be around 9.4, will see :lol:

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Re: CZ527 carbine 7.62x39

Post by SHV » 10 Jul 2017, 6:48 pm

Gwion wrote:I wouldn't be too worried anout that different POI. As lol Ng as it is consistent and you can learn its drops. If it is s concern, as above, try a different powder.


my SAKO A7 308 looks alright, the POI almost the same for the factory hunting ammo, factory target ammo and reload, the bad thing is maybe the barrel is too good, reloading test looks like the same, hard to tell which is the best point, any idea? which load I should try? maybe 42.5 gr?

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Re: CZ527 carbine 7.62x39

Post by duncan61 » 10 Jul 2017, 6:56 pm

I remember doing all this for my rifles.222 .243 and 7mm Rem Mag.I have standard loads now its worth the effort to know your rounds are on point.Love your work its what this forum is all about
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Re: CZ527 carbine 7.62x39

Post by Gwion » 11 Jul 2017, 6:26 am

Hard to say. What range are those groups shot at?
Maybe try 3x5 each of 2nd from left top and 3rdfrom left bottom (on my phone hard to read charge weights).
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Re: CZ527 carbine 7.62x39

Post by SHV » 26 Jul 2017, 10:40 pm

the best factory ammo 5 shot(indoor 50 meters), S&B ammo is good but different batch performs different, the plastic divider in the ammo box white color batch is much better than the green color ones

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Re: CZ527 carbine 7.62x39

Post by SHV » 26 Jul 2017, 10:49 pm

TB load, 10.0---9.6---9.2---8.8---8.4--8.1, at max load it spreads a lot, getting better at 8.1, seems nearly there, next time try 7.9---7.7---7.5 each 5 shot to find out, the good thing is POI didn't change too much compares to factory ammo

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Re: CZ527 carbine 7.62x39

Post by MickW » 28 Jul 2017, 8:12 pm

No1Mk3 wrote:Dear MickW,
I am sorry to hear your vacillation regarding 30/30 lever or 7.62x39 bolt is causing hardship, so may I offer a way to ease your suffering that I have used for many years? Find a quiet spot near your gunsafe, assume the Lotus Position, close your eyes and repeat, "I can have BOTH...I can have BOTH...I can have BOTH" before you know it, you will be at peace.


Cheers Mk3 its worked. The Howa Mini is ready for pickup tomorrow. :drinks:
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Re: CZ527 carbine 7.62x39

Post by duncan61 » 29 Jul 2017, 12:20 am

Did you read Elmers post on sorting runout on factory ammo
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Re: CZ527 carbine 7.62x39

Post by SHV » 10 Aug 2017, 12:20 am

Trail Boss test

7.9gr, 7.7 gr and 7.5 gr

seems 7.7 is good but got one fly and it's far away from the main group cluster :oops: next time will try 10 x to find out if it's the best

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Re: CZ527 carbine 7.62x39

Post by in2anity » 10 Aug 2017, 12:21 pm

Nice SHV - remember TB isn't renowned for it's pinpoint accuracy. It's advantage comes from its economy and less wear-and-tear on your rifle.
At what point does lack of maintenance become patina?
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Re: CZ527 carbine 7.62x39

Post by Gwion » 10 Aug 2017, 2:42 pm

Not sure what primers are used in that cartridge but I definitely found that using Small Rifle MAGNUM primers for Trail Boss in my 223 improved consistent velocity as well as precision and group size. In fact, I literally just finished priming 50 cases with SRM primers for a fresh batch of TB 223rem.
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Re: CZ527 carbine 7.62x39

Post by SHV » 10 Aug 2017, 4:03 pm

in2anity wrote:Nice SHV - remember TB isn't renowned for it's pinpoint accuracy. It's advantage comes from its economy and less wear-and-tear on your rifle.


reasonable accuracy will be ok, it is fun to shoot
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Re: CZ527 carbine 7.62x39

Post by SHV » 10 Aug 2017, 4:06 pm

Gwion wrote:Not sure what primers are used in that cartridge but I definitely found that using Small Rifle MAGNUM primers for Trail Boss in my 223 improved consistent velocity as well as precision and group size. In fact, I literally just finished priming 50 cases with SRM primers for a fresh batch of TB 223rem.


is there large rifle magnum primer you can buy for LGS? also do you need to enlarge the hole on the case?
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Re: CZ527 carbine 7.62x39

Post by Gwion » 10 Aug 2017, 5:33 pm

No you don't have to enlarge anything. A quick web search will tell you what primers are available.
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