QL Request - .270 Win

[NYDAN]

I was finally able to find some IMR 4831 powder today. Would someone be so kind as to run a QL projection with the following information:

.270 Win
24" Barrel
140gr. Nosler AB
IMR 4831
Overflow case capacity of 71.3 gr.
OAL 3.350"

Thank you.

 

[DrMike]

Cartridge          : .270 Win. (SAAMI)
Bullet             : .277, 140, Nosler AccuBond 54765
Useable Case Capaci: 63.846 grain H2O = 4.145 cm³
Cartridge O.A.L. L6: 3.350 inch = 85.09 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : IMR 4831

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    46.00   2497    1939   33870   9593     96.7    1.512
-18.0   84    47.15   2556    2031   36139   9831     97.5    1.475
-16.0   86    48.30   2615    2125   38551  10053     98.2    1.432
-14.0   88    49.45   2673    2221   41112  10259     98.7    1.389
-12.0   90    50.60   2731    2318   43833  10448     99.2    1.347
-10.0   92    51.75   2788    2416   46724  10618     99.6    1.307
-08.0   94    52.90   2845    2516   49793  10769     99.8    1.269
-06.0   96    54.05   2901    2616   53061  10900    100.0    1.232
-04.0   98    55.20   2957    2717   56532  11010    100.0    1.196  ! Near Maximum !
-02.0  100    56.35   3012    2819   60225  11113    100.0    1.162  ! Near Maximum !
+00.0  102    57.50   3066    2922   64156  11213    100.0    1.129  ! Near Maximum !
+02.0  104    58.65   3120    3026   68342  11310    100.0    1.098  !DANGEROUS LOAD-DO NOT USE!
+04.0  106    59.80   3173    3130   72804  11403    100.0    1.067  !DANGEROUS LOAD-DO NOT USE!
+06.0  108    60.95   3226    3236   77565  11493    100.0    1.038  !DANGEROUS LOAD-DO NOT USE!
+08.0  110    62.10   3279    3342   82648  11579    100.0    1.010  !DANGEROUS LOAD-DO NOT USE!
+10.0  112    63.25   3331    3450   88082  11661    100.0    0.983  !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    57.50   3167    3117   76233  10819    100.0    1.051  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    102    57.50   2912    2637   52135  11573     98.7    1.236

 

[hubcap]

Based on my own chrony data with the 140AB that quick load is right on again. In my 22 inch barrel 57 grains does 2995. If I had 2 more inhes of barrel quick load would be nearly dead nuts. Again, I,m impressed wth it. IMR-4831 will surely deliver with 140,s and 150,s. IMR-4831 does it with a reasonal amount of powder while still allowing room for the bullet. Darn good combination I think.

 

[NYDAN]

Dr. Mike, thank you for your help. I look forward to trying out this powder.

Dan

 

[DrMike]

I believe it will serve you well with that bullet. You should have a good load in no time.