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 CZ 527 in 7.62x39 mm
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TEC
Average Member

126 Posts

Posted - Mar 17 2017 :  13:55:28  Show Profile Send TEC a Private Message  Reply with Quote
My brother just purchased the CZ 527 carbine w/ 18.5 in barrel, 1/9.5 twist. I made him a present of 100 pieces of Lapua brass and a box of Sierra GK 150 gr, .311 bullets. Haven't purchased a die set, yet. My plan is to load up the new Lapua brass as is, seating with a 308 seating die to fit the 5-shot mag, fire form, then use a Lee collet neck sizer for the once fired brass. I have heard or read the Mauser action on the CZ allows a hotter load than the factory loads (Wolf, steel case or Privilege Partizan brass) meant for AKs, SKS, or "lesser" mil surplus rifles.

So...
1. Any potential problem if I seat the .311 bullets with a .308 die?
2. Any specific suggestions for optimum powder, load suggestions for 150 GK's inthe CZ carbine?

Thanks much for any first hand info on 7.62x39 loads for the carbine.


Shastaboat
Advanced Member



USA
9124 Posts

Posted - Mar 17 2017 :  18:16:07  Show Profile Send Shastaboat a Private Message  Reply with Quote
My 7.62 Lee die set came with both a .308 and a .310 expander plug.
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MR 8x57js
Junior Member



USA
51 Posts

Posted - Mar 18 2017 :  19:09:07  Show Profile Send MR 8x57js a Private Message  Reply with Quote
1. Any potential problem if I seat the .311 bullets with a .308 die? Yes your talking 2.000th difference. Have you slugged the barrel to see if it's .311 or .308 ? Use the correct
expander ball base on the bore diameter.
2. Any specific suggestions for optimum powder, load suggestions for 150 GK's inthe CZ carbine?
The 150 Gr bullets are heavy and long which may intrude into the powder space, the 7.62x39 performs better with a 123-125 Gr bullets.

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TEC
Average Member

126 Posts

Posted - Mar 18 2017 :  19:43:00  Show Profile Send TEC a Private Message  Reply with Quote
Will check the brass size with gage, but expect to be able to load new Lapua brass first time without need to resize before first load. The CZ 527 in 762x39 is .311, not .308. The only 308 die I will use for first loading is the bullet seating die, which shouldn't be a problem. After all, both Horady and Lee die sets come with both .308 and .311 neck sizers. I assume they come with only one seating die which should work with either. I think it's reasonable to assume that a 308 seating die wil seat a .311 bulge in properly sized brass. Will check to see that COL that fits the factory magazine chambers properly. So...

Has anyone else ever worked up a 150 gr spritzer load for the CZ 527 carbine Mauser action in 762x39, .311 and 18.5 inch barrel? Thanks.
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Onondaga
Advanced Member



USA
4017 Posts

Posted - Mar 19 2017 :  02:26:51  Show Profile Send Onondaga a Private Message  Reply with Quote
TEC

That caliber is also very well suited for Deer hunting with cast bullets. The X39 is nearly the same internal volume as a 30-30 that is great for Deer with cast bullets and the loads easily duplicate.
I hunt deer with cast bullets in a single shot X39 Remington Spartan rifle with a chrome lined 24" barrel. It loves cast and shoots great, I have 2 friends that have the CZ and they hunt Deer with cast bullets in them. Correctly sized 30-30 flat nose gas checked cast bullets shoot great in X39. I shoot a 165 gr FNGC at 2055 with AA2230.

Gary

Fine rifles are never really owned.
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Zero333
Advanced Member



Canada
810 Posts

Posted - Mar 19 2017 :  07:35:55  Show Profile Send Zero333 a Private Message  Reply with Quote
I have no experience with reloading 7.62x39 Russ. but if you don't find anything worth pursuing maybe the following data might get you started...

Quickload Optimal barrel time prediction points around 27.8 gr of H-335...
150 gr .311" Sierra SP (#2300)
2.190" coal.
2,146 fps.
43,210 psi.
18.5" stick.

Next node shows up around 29.45 gr H-335
2,285 fps.
52,976 psi.


Try H-335 from 27 gr to 29.4 gr in 0.3 gr increments watching for pressure signs when nearing 29 gr (ie.. Heavier bolt lift especially during primary extraction nearer the top of the bolt lift and extractor imprint half moon or full moon on the case head )



Treat that trigger like it’s your first date, not like you’ve been married to it for 20 years.

Edited by - Zero333 on Mar 19 2017 07:39:51
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TEC
Average Member

126 Posts

Posted - Mar 19 2017 :  12:33:50  Show Profile Send TEC a Private Message  Reply with Quote
Thanks guys. Very helpful.
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Shastaboat
Advanced Member



USA
9124 Posts

Posted - Mar 20 2017 :  09:58:11  Show Profile Send Shastaboat a Private Message  Reply with Quote
My Ruger Stainless 77 (bolt) in 7.62x39 shoots the Wolf factory ammo so well and with the case lots I own I haven't bothered to try to beat the Wolf factory stuff. Wolf 122 gr HP chronoed at 2464 fps in my rifle. In my initial loading tests I was shooting 31.5 gr of MR223 behind a 123 gr Hornady SP for 2175 fps.

I bought a couple of cases of the Wolf ammo when it was $65.00 a thousand rounds. I can't load for that cheap.

Edited by - Shastaboat on Mar 20 2017 10:00:03
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MR 8x57js
Junior Member



USA
51 Posts

Posted - Mar 20 2017 :  10:00:03  Show Profile Send MR 8x57js a Private Message  Reply with Quote
If your using a Sierra GK 150 gr, .311 bullets. than use the .311 seating die
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