QuickLoad question for 7.62x39 SKS

[rick3]

I've seen a lot of loads for the 7.62x39 posted online, but I don't remember ever seeing a QuickLoad one for that caliber for the SKS...can someone give me some numbers based on these factors:

21.5" barrel
35.1 gr water case capacity
Sierra 125 gr, .311 bullet (#2305)
Sierra 150 gr, .311 bullet (#2300)
Reloder 7 powder

Thanks

 

[DrMike]

Cartridge          : 7.62 x 39 (M43) Russ.
Bullet             : .311, 125, Sierra SP 2305
Useable Case Capaci: 30.167 grain H2O = 1.959 cm³
Cartridge O.A.L. L6: 2.190 inch = 55.63 mm
Barrel Length      : 22.0 inch = 558.8 mm
Powder             : Alliant Reloder-7

Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step    Fill. Charge   Vel.  Energy   Pmax   Pmuz  Prop.Burnt B_Time
 %       %    Grains   fps   ft.lbs    psi    psi      %        ms

-20.0   82    22.00   2056    1173   26695   3667     90.5    1.419
-18.0   84    22.55   2103    1228   28405   3770     91.6    1.382
-16.0   86    23.10   2150    1284   30227   3871     92.6    1.345
-14.0   88    23.65   2198    1340   32168   3967     93.6    1.310
-12.0   90    24.20   2244    1398   34237   4059     94.5    1.276
-10.0   92    24.75   2291    1457   36442   4147     95.3    1.243
-08.0   94    25.30   2338    1517   38792   4230     96.1    1.211
-06.0   96    25.85   2384    1577   41299   4308     96.8    1.179
-04.0   98    26.40   2430    1639   43974   4381     97.4    1.148  ! Near Maximum !
-02.0  100    26.95   2476    1701   46830   4449     98.0    1.118  ! Near Maximum !
+00.0  102    27.50   2521    1764   49881   4511     98.5    1.089  ! Near Maximum !
+02.0  104    28.05   2566    1828   53143   4566     98.9    1.061  !DANGEROUS LOAD-DO NOT USE!
+04.0  106    28.60   2611    1893   56634   4616     99.2    1.035  !DANGEROUS LOAD-DO NOT USE!
+06.0  108    29.15   2656    1958   60374   4659     99.5    1.009  !DANGEROUS LOAD-DO NOT USE!
+08.0  110    29.70   2700    2024   64385   4695     99.8    0.984  !DANGEROUS LOAD-DO NOT USE!
+10.0  112    30.25   2744    2090   68693   4724     99.9    0.960  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba    102    27.50   2625    1913   59473   4369    100.0    1.018  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    102    27.50   2378    1569   40691   4440     93.1    1.184

Cartridge          : 7.62 x 39 (M43) Russ.
Bullet             : .311, 150, Sierra SP 2300
Useable Case Capaci: 27.115 grain H2O = 1.761 cm³
Cartridge O.A.L. L6: 2.190 inch = 55.63 mm
Barrel Length      : 22.0 inch = 558.8 mm
Powder             : Alliant Reloder-7

Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step    Fill. Charge   Vel.  Energy   Pmax   Pmuz  Prop.Burnt B_Time
 %       %    Grains   fps   ft.lbs    psi    psi      %        ms

-20.0   81    19.52   1851    1141   26952   3343     92.6    1.554
-18.0   83    20.01   1892    1193   28649   3432     93.5    1.513
-16.0   85    20.50   1934    1246   30453   3519     94.4    1.473
-14.0   87    20.98   1975    1299   32372   3601     95.2    1.435
-12.0   89    21.47   2016    1354   34413   3680     96.0    1.398
-10.0   91    21.96   2057    1409   36583   3755     96.7    1.362
-08.0   93    22.45   2098    1466   38892   3825     97.3    1.327
-06.0   95    22.94   2138    1523   41350   3891     97.9    1.292
-04.0   97    23.42   2178    1580   43967   3952     98.4    1.259  ! Near Maximum !
-02.0   99    23.91   2218    1639   46756   4009     98.8    1.228  ! Near Maximum !
+00.0  101    24.40   2258    1698   49728   4060     99.2    1.197  ! Near Maximum !
+02.0  103    24.89   2297    1757   52899   4105     99.5    1.168  !DANGEROUS LOAD-DO NOT USE!
+04.0  105    25.38   2336    1817   56285   4146     99.7    1.139  !DANGEROUS LOAD-DO NOT USE!
+06.0  107    25.86   2374    1878   59904   4180     99.9    1.112  !DANGEROUS LOAD-DO NOT USE!
+08.0  109    26.35   2413    1939   63777   4209    100.0    1.085  !DANGEROUS LOAD-DO NOT USE!
+10.0  111    26.84   2451    2001   67925   4231    100.0    1.059  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba    101    24.40   2343    1828   59184   3892    100.0    1.122  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    101    24.40   2137    1520   40643   4047     94.6    1.298

 

[rick3]

Thank you, DrMike!

 

[Rocketvapor]

WOW DrMike,
I'm not a QL guy but your data is spot on.
I play with an SKS quite a bit and with the 123gr V-max (0.310") and Rel 7.

27gr is about the best point for my particular SKS, a couple tenths less for the wife's.
I get an average of 2450 in my SKS, 2470 in the wife's with 27gr.
I tried 27.3 and groups opened up a little. Never went higher.
26.6gr and they opened up on the low end with 2420 avg velocity.

I guess the X39 and QL are a good fit.

OK, now another question.
This NEW powder, Hodgdon CFE BLK that was released for the .300 BLK has on-line data for the X39. BUT, it seems a little suspect.

Here's their 125gr data for the 7.62X39
Compared to the other powders listed for the 7.62X39, 125 gr @wwpowderdotcom

BL-C(2) .311" 2.150" 30.0 2,155 32,200 CUP 31.5 2,349 38,800 CUP
H335 .311" 2.150" 30.0 2,219 35,400 CUP 31.5 2,408 40,900 CUP
H4895 .311" 2.150" 28.0 2,171 29,900 CUP 29.0 2,249 33,600 CUP
H322 .311" 2.150" 28.0 2,210 32,900 CUP 29.0 2,323 35,400 CUP
IMR 4198 .311" 2.150" 22.6 2,035 36,800 CUP 24.0 2,250 42,500 CUP
CFE BLK .310" 2.150" 27.5 2,377 34,200 CUP 29.7 2,554 40,500 CUP
H4198 .311" 2.150" 24.5 2,190 34,200 CUP 26.5 2,378 40,400 CUP

LOOK !!! 100fps for free

Now, here's the 108, 125, and 150 data,
for a 108 GR. BAR RRLP FB
CFE BLK .310" 2.210" 24.9 2,301 38,100 CUP 27.0 2,471 41,400 CUP
for a 125 GR. SPR SP
CFE BLK .310" 2.150" 27.5 2,377 34,200 CUP 29.7 2,554 40,500 CUP
for a 150 GR. HDY SP
CFE BLK .312" 2.220" 22.6 1,984 37,800 CUP 24.5 2,156 43,200 CUP

Look at the loads. Does it look like a cut and paste error to anyone but me?

 

[Rocketvapor]

I used a 101.5 grain steel case as the light one and a 106.65 grain case as the heavy one.
Light case; 6.577 grams empty, 8.867 grams full of water, 2.290 grams of water (35.34gr).
Heavy case; 6.909 grams empty, 9.145 grams full of water, 2.236 grams of water (34.51gr).
The heavy case is 5% heavier than the light case.
The light case holds 2.4% more water than the heavy case.

I usually cull out the few light and heavy cases.
I did not calculate usable volume.