7.62X39

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  • Last Post 16 September 2016
gpidaho posted this 04 September 2016

I brought home a new CZ527 carbine last week, it's chambered in 762X39 and has a 1 in 9.5 twist. The bore slugs .312 by just over .300 and is four grooved. According to Greenhill this should stabilize a bullet up to 273gr. and 1.45 inches long. (A big plenty of lee-way) I have on hand several moulds in 30cal. from 90gr. to 230gr. and I'm still toying with heavy for caliber subsonic rounds. So my question is, have any of you stepped up beyond the usual 125gr to 150gr. in the 762X39 and if so, how heavy have you tried and how well did they shoot?  I'll get started on this next week when the new bullet sizers arrive from NOE. Thanks  Gp

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onondaga posted this 04 September 2016

My Remington Spartan single shot 7.62X39 with a 24"chrome lined barrel likes the full variety of cast bullet weights.

The Lee 300 AAC bullet with a BC of .640  at 230 gr in #2 alloy shoots OK but not spectacular for me. I size the bullet .3125” for my chamber throat. LOA 2.500” I shoot the bullet not gas checked or gaschecked with 5.6 gr H TiteGroup that clocks 952 fps groups 1.2” @ 50 yards.

My hunting loads are much more accurate:

Deer hunting I use the RD 165 FNGC in #2 Alloy sized .3125", LOA 2.240, 26 gr AA2230, clocks 2052 fps groups under 1/2"@50 yards

Squirrel hunting I use the Lee TL314-90-SWC in #2 Alloy sized .3125", LOA 1.900", 2.9 gr H titegroup clocks 1160 fps and groups well under 1/2” @ 50 yards. This little flat nose pistol bullet has a bevel base and tumble lube grooves and shoots spectacularly for me from the 7.62X39 Spartan. If you want a small game bullet for your CZ, I don't think you can top this one.

http://s30.photobucket.com/user/rhymeswithwhat/media/X3990gr.jpg.html>http://s30.photobucket.com/user/rhymeswithwhat/media/RD762X39.jpg.html>http://s30.photobucket.com/user/rhymeswithwhat/media/ogive_zpsfe482223.jpg.html>

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Ed Harris posted this 04 September 2016

My Sako A2 is dimensioned and twisted similar to yours and shoots well with NOE clone of #314299 with compressed caseful of 4895, 4064, RL15 or Varget, just scoop case full, hold finger over case mouth and rap 4 times against bench top to settle powder, hand seat bullet in case with fingers, chamber and shoot. Use bullets sized .312, just recap and reprime at bench, brush out and wipe outside of fired case and reload without resizing.

73 de KE4SKY In Home Mix We Trust From the Home of Ed's Red in "Almost Heaven" West Virginia

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gpidaho posted this 04 September 2016

Gary: Glad to have you chip in as I know you enjoy the 762X39 round. I have the Lee mould for the blackout and have tried it in several 30cals. AS you say workable but less than spectacular. I'm real fond of the TL314-90-swc and it gets used a lot around here. My first try will be with the Lee C309-150-F powder coated to bring it up to size. Thanks for your load suggestions as books are pretty thin on info above 150gr. Gp

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gpidaho posted this 04 September 2016

Thanks Ed. I really like the NOE moulds and though I have many 30cals. already one more couldn't hurt. I know the 299s are a favorite. I will give the easy route a try as you suggest and thanks for the full case loads. Gp

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onondaga posted this 05 September 2016

http://www.castbulletassoc.org/view_user.php?id=8045>gpidaho

I honed my Lee C309-150 and 170 F molds at the driving bands to be large enough to size .3125” for my 7.62X39.  I use the Slugnut method with dish-soap and flowers of pumice.. Powder-coatings don't equal metal. Fitting a bare bullet to size will shoot the best. My used “SLUGNUT":

http://s30.photobucket.com/user/rhymeswithwhat/media/SlugNuts.jpg.html>

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gpidaho posted this 05 September 2016

Gary: I've opened Lee moulds with that exact method (well almost) I used valve grinding compound and tooth paste. It works well but PC is much easier and the BHN of the coating runs about 40. My opinion is that it's as good as adding metal. It's worked for me in every instance I've tried in many calibers. To each their own. Thanks for your input. Gp

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rockquarry posted this 05 September 2016

Beyond 150 grains, I've used the following moulds: Lyman #311466(159 grs.), LBT 314-155SP (161 grs.), NEI .311-155-GC (167 grs.), SAECO #315 (177 grs.), Lyman #311041 (183 grs.), Lyman #311291 (186 grs.), RCBS 30-180SP (191 grs.), SAECO #301 (200 grs.), and the Lyman #311335 (217 grs.)

Bullets were shot in two new Ruger 77 MK II stainless rifles from the first run of these bolt-action rifles made for Davidson's in about 1991. Guns had a 1 in 10” twist and, according to Ruger, had .310” to .311” bores. They shot most heavy bullets well, but I would have to refer to my notes for the details.

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gpidaho posted this 10 September 2016

Ed: As per previous post I ordered in a new NOE 314299. In making a test round I find that the longest COL that will function through the CZ's magazine is 2.300. The CZ being a controlled feed I would like to use the magazine as apposed to single feeding the rounds. By my measurements IMR 4895 fills the case full @29gr. and 24gr. fills to the base of the neck. The ID of the neck on a fired case is .317 and the bore slugs .312X.300. So my thought is the NOE 314299 sized .300 on the nose and .314 on the bands over 24gr. IMR4895. This being in full sized brass expanded with the NOE .312 expander plug. Do you see any problem loading to these specs? Gp

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onondaga posted this 10 September 2016

http://www.castbulletassoc.org/view_user.php?id=8045>gpidaho

Start Shooting!

Gary

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M3 Mitch posted this 13 September 2016

I have been looking at this CZ carbine myself. Impatiently awaiting results from you guys who have already taken the plunge - but I would be astounded if these don't shoot cast very, very well. Anyone having bad results, I would guess it's because they are using a bullet undersized for this gun, which I think most .310 for .308 bore bullets would be.

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tturner53 posted this 13 September 2016

If I may, a slight sideways hijack while you guys are here; I have an H&R 7.62x39 Topper type. They are known for not going bang with commie milsurp ammo. Disregarding common sense is there a reasonable cure for this? I've searched the topic and found no joy. Thanks for indulging me.

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M3 Mitch posted this 13 September 2016

I have heard that in general military primers tend to be “hard” in order to avoid slam-fires in full-auto shooting. If this is the problem with the mil-surp ammo, stands to reason that a heavier hammer spring might cure the problem.

I'm guessing this is not a headspace issue, since with a break-open excess headspace is pretty obvious when you load a round.

I'm speculating here, no direct experience with this round (yet).

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gpidaho posted this 14 September 2016

I agree with Mitch. The anti-slamfire primers are pretty hard. I was surprised to read in the paper work (manual) that CZ actually recommends the use of the lacquered steel cases. Seems they had the economy ammo in mind when building these carbines. First time shooting more than break-in rounds today. Fired about forty rounds. I like this light and handy little rifle. I see Bud's has them in 221 Fireball. Hummmm Gp

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RicinYakima posted this 16 September 2016

TT, I have that rifle, and they are correct, it will not indent old east bloc military primers. With the lots that will accuracy is terrible. So I just found some WW and load regular US primers. HTH, Ric

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