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chrono of 3 chinese factory 762x39 SC loads here+1 L.C.B

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  • chrono of 3 chinese factory 762x39 SC loads here+1 L.C.B

    71 / '91 (brown laquor cases)

    311 / '92 (copper wash cases)

    31 / '92 (copper wash cases)

    all are steelcore boattail bullets , ~1.040" LOA , G5 BC# .196 . all from yellow boxes w/black printing , "CHINA NORTH INDUSTRIES CORPORATION" with the red NORINCO name/seal on them . all have different printing fonts but say the same stuff except the box with 31-'92 in it says STEEL CORE BULLET also . all say non-corrosive . dont believe it !

    i'm gonna try shooting for groupsize @100M while chronoing at the same time and will shoot the Russian ammo from the last test for group also . not that it means much , all coming from the same rifle , who knows how any of it will shoot from yours ?



    [ June 19, 2004, 08:41: Message edited by: Yoda-Dad ]

  • #2
    82 F. , 16.25"B , @15ft. , 10shots .

    31-'92 , the latest date steelcore of this factory i've chronoed .
    AVE 2292fps
    HI ,2318
    LO ,2274
    ES , 44
    SD , 12
    2288 , 2318 , 2281 , 2281 , 2289 , 2305 , 2292 , 2274 , 2295 , 2299

    every year factory 31 Chinese 'PS' steelcore from '70 to '92 is positivly premo-stuff ! you could mix all those years in the same mag and not be able to tell the diff by group size . the AVE. velocity varies by no more than ~25fps ! factory 31 has the hardest of the 'mild' steelcore Chinese ammo - proved by my testing and confirmed by other collectors (still not real AP tho) . factory 71 cores are the most 'maliable' , almost deadsoft but still far tuffer than any lead alloy.

    311-'92
    AVE 2301fps
    HI ,2315
    LO ,2291
    ES , 24
    SD , ,9
    2314 , 2293 , 2291 , 2298 , 2296 , 2315 , 2293 , 2298 , 2301 , 2314

    71-'91 - brown cases
    AVE 2282fps
    HI ,2322
    LO ,2249
    ES , 73
    SD , 24
    2322 , 2288 , 2249 , 2256 , 2308 , 2284 , 2298 , 2278 , 2289 , 2249

    all great stuff .

    tryed to test for accuracy @200M but circumstances prevented me from my best shooting . 6 to 7 of each 10 went into 5"h x6"w groups . im sure all these could do better than that . mostly , 3 or 4 rounds hit close together in shifting groups like that do to my bleary eyes , showing that i had not the same POA hold all the time . along with an improper target for 200M and 10 other distractions .
    i really would have enjoyed the parade of turkeys and does w/fawns if i didnt have such limited time to work with today
    some skeeters didnt mind a bugspray-flavored YODA-SLURPY either !

    another little tidbit about Chinese 762x39 ammo , factory 31 , 311 and 351 in particular . if you look closly at the chrono data above you'll see that the velocities recorded are in little groups of 'islands' where they are very close or even the same fps .
    also , if you examine the cartridge headstamps closly with a magnifying glass , you'll see slight variations in the size/shape of the FONT of the numbers . i forget the word used by collectors to describe this - i believe , in this instance these represent different case-forming machines making cases with ever-so-slightly different internal volumes .
    anyway , if you separated these various FONTS into groups and shot them seperated you'ld see ExtreemSpreads for 10 shots around 10 fps or so , sometimes LESS ! i did this once and 6/10 shots recorded THE SAME VELOCITY !

    so much for there supposedly being no 'match' grade 762x39 ammo !

    another thing about chinese ammo (only tested this with fact 31) , insensistivity to temperature . about -10fps diff in ave. from 80F to 30F. , about +15/+20fps diff from 80F to 100+F .

    [ June 17, 2004, 13:24: Message edited by: Yoda-Dad ]

    Comment


    • #3
      I like the fonts. True arcanum. I did notice the new Wolf greyish polymer coated cases I shot had a different, larger font for the word Wolf. New tooling?

      Comment


      • #4
        this is 31-'93 headstamp w/ M67 type FMJ-FB lead core . dark green box w/ white lettering say :
        EXPORTED BY
        CHINA JING AN EQUIPMENT IMP/EXP.CORP
        7.62 x 39MM AMMUNITION
        LEAD-CORE
        NON-CORROSIVE
        ________________20 CARTRIDGES


        GREEN bullet/case sealent is only used on LCB from this factory (pink/red=steelcore).
        bullets are 0.905" long . a couple 31- '92 leadcore bullets were 0.915" long . it dont matter much to the ~.164 G6 B.C.

        this ammo shows quality at Chinese fact.31 started going downhill , from 1993 on . looks the same on the outside . still , considering , not BAD ammo . shot a lot of this at my steeltorso target and was abile to hit it @300M nearly every time from prone with any weapon . shot to nearly the same POA/POI as steelcore and the 351-'92 softpoints but , larger groups generaly.

        31-'93 , 55F. 20.5"B , only 8 shots registerd error free
        AVE 2370fps
        HI ,2430
        LO ,2357
        ES , 73

        16.25" B , 78F , 13 of 15 registerd error free
        AVE 2333fps
        HI ,2393
        LO ,2278
        ES , 115
        most shots went between 2310 and 2360fps with 2 each-outliers near the HI and LO velocity .

        it was definatly dirtier than i've ever seen with fact.31 ammo . the fired cases were sooted up .

        Comment


        • #5
          Originally posted by MartinS:
          I like the fonts. True arcanum.
          to the n'th degree

          Originally posted by MartinS:

          I did notice the new Wolf greyish polymer coated cases I shot had a different, larger font for the word Wolf. New tooling?
          i've no idea there ? ya know , i should see if there is any variation in the same box . i dont think there is but , never looked that close at Wolf cases ...

          Wolf ammo also shows 'islands' of velocity readings ...

          Comment

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