QL request

[mkk]

Ruger 270 WSM
22" barrel 1/10
Winchester brass
CCI #34
H4831sc
Speer 130 Hot-Cor #1459


Thanks
Mike

 

[DrMike]

Cartridge          : .270 WSM
Bullet             : .277, 130, Speer SP 1459
Useable Case Capaci: 75.231 grain H2O = 4.885 cm³
Cartridge O.A.L. L6: 2.860 inch = 72.64 mm
Barrel Length      : 22.0 inch = 558.8 mm
Powder             : Hodgdon H4831 SC *T

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% 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

-10.0   89    62.37   2842    2331   45072  13128     93.0    1.232
-09.0   90    63.06   2875    2386   46610  13301     93.5    1.213
-08.0   91    63.76   2909    2442   48200  13471     94.1    1.193
-07.0   92    64.45   2942    2498   49837  13636     94.6    1.175
-06.0   93    65.14   2975    2556   51525  13797     95.1    1.156
-05.0   94    65.84   3009    2613   53268  13954     95.6    1.138
-04.0   95    66.53   3042    2672   55072  14107     96.0    1.121  ! Near Maximum !
-03.0   96    67.22   3076    2731   56939  14254     96.4    1.103  ! Near Maximum !
-02.0   97    67.91   3109    2791   58872  14396     96.9    1.086  ! Near Maximum !
-01.0   98    68.61   3143    2851   60874  14533     97.2    1.069  ! Near Maximum !
+00.0   99    69.30   3177    2913   62947  14665     97.6    1.053  ! Near Maximum !
+01.0  100    69.99   3210    2974   65096  14791     97.9    1.037  !DANGEROUS LOAD-DO NOT USE!
+02.0  101    70.69   3244    3037   67322  14911     98.3    1.021  !DANGEROUS LOAD-DO NOT USE!
+03.0  102    71.38   3277    3100   69629  15025     98.5    1.005  !DANGEROUS LOAD-DO NOT USE!
+04.0  103    72.07   3311    3164   72022  15132     98.8    0.990  !DANGEROUS LOAD-DO NOT USE!
+05.0  104    72.77   3344    3228   74504  15233     99.0    0.974  !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     99    69.30   3330    3200   74669  14565    100.0    0.975  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     99    69.30   2975    2555   51482  14040     91.1    1.153

 

[mkk]

DrMike
I also have H4350 on hand. Would you run one on that powder as well? Which one would you use based off of what QL predicts?

Thanks
Mike

 

[DrMike]

Cartridge          : .270 WSM
Bullet             : .277, 130, Speer SP 1459
Useable Case Capaci: 75.231 grain H2O = 4.885 cm³
Cartridge O.A.L. L6: 2.860 inch = 72.64 mm
Barrel Length      : 22.0 inch = 558.8 mm
Powder             : Hodgdon H4350 *T

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% 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

-10.0   86    58.14   2848    2342   46652  12594     97.0    1.217
-09.0   87    58.79   2878    2390   48058  12730     97.3    1.199
-08.0   88    59.43   2907    2439   49502  12861     97.6    1.183
-07.0   89    60.08   2936    2489   50987  12989     98.0    1.166
-06.0   89    60.72   2965    2538   52514  13112     98.2    1.150
-05.0   90    61.37   2994    2588   54083  13231     98.5    1.134
-04.0   91    62.02   3023    2639   55697  13345     98.8    1.118  ! Near Maximum !
-03.0   92    62.66   3052    2689   57356  13456     99.0    1.103  ! Near Maximum !
-02.0   93    63.31   3081    2740   59062  13561     99.2    1.088  ! Near Maximum !
-01.0   94    63.95   3110    2792   60816  13662     99.4    1.073  ! Near Maximum !
+00.0   95    64.60   3139    2844   62621  13757     99.5    1.059  ! Near Maximum !
+01.0   96    65.25   3167    2895   64477  13848     99.7    1.044  !DANGEROUS LOAD-DO NOT USE!
+02.0   97    65.89   3196    2948   66387  13934     99.8    1.030  !DANGEROUS LOAD-DO NOT USE!
+03.0   98    66.54   3224    3000   68351  14014     99.9    1.017  !DANGEROUS LOAD-DO NOT USE!
+04.0   99    67.18   3252    3053   70373  14090     99.9    1.003  !DANGEROUS LOAD-DO NOT USE!
+05.0  100    67.83   3280    3106   72454  14159    100.0    0.990  !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     95    64.60   3256    3060   72680  13388    100.0    0.989  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     95    64.60   2974    2554   52558  13575     95.5    1.149

I don't believe you will make a mistake with either of those propellants. The H4350 is marginally more efficient, but the velocities obtained and the difference in charge is miniscule. H4931 provides slightly higher velocities. I doubt that you'll actually witness any great difference regardless of which powder you use. You'll be pleased with the result, regardless. Give us a read out of your results when you have them.

 

[mkk]

Thankyou sir