300 Win Mag quickload help.

Wis65x55 · Jul 17, 2021

I want to spot check quickload data for a 300 Win mag. I am using nosler brass with a water volume of 90.3gr, Viht 565, 200gr Partition, 26"barrel, 1:8 twist, max coal 3.42"
70.5 2821fps
71.0 2769
71,5 2771
72.0 2842
72.5 --
73.0 2873
73.5 2875
74.0 2895
74.5 2906
75.0 2940

SJB358 · Jul 17, 2021

I’m not sure on a spot check, but I’d certainly like to see what 73-74.5 does on paper.

DrMike · Jul 17, 2021

Code:

Cartridge          : .300 Win. Mag.(N)
Bullet             : .308, 200, Nosler PART SP 35626
Useable Case Capaci: 79.937 grain H2O = 5.190 cm³
Cartridge O.A.L. L6: 3.420 inch = 86.87 mm
Barrel Length      : 26.0 inch = 660.4 mm
Powder             : Vihtavuori N565 *C

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    67.50   2541    2868   37392  10610     94.3    1.617
-09.0   90    68.25   2571    2936   38651  10743     94.8    1.591
-08.0   91    69.00   2601    3004   39953  10872     95.3    1.566
-07.0   92    69.75   2631    3074   41300  10997     95.8    1.542
-06.0   93    70.50   2661    3144   42693  11118     96.3    1.518
-05.0   94    71.25   2691    3216   44133  11236     96.7    1.494
-04.0   95    72.00   2721    3288   45623  11349     97.1    1.471
-03.0   96    72.75   2751    3360   47164  11457     97.5    1.448
-02.0   97    73.50   2781    3434   48759  11561     97.8    1.426
-01.0   98    74.25   2811    3508   50409  11661     98.1    1.404
+00.0   99    75.00   2840    3583   52117  11755     98.4    1.382
+01.0  100    75.75   2870    3658   53884  11845     98.7    1.361  ! Near Maximum !
+02.0  101    76.50   2900    3735   55714  11930     99.0    1.340  ! Near Maximum !
+03.0  102    77.25   2930    3811   57609  12009     99.2    1.320  ! Near Maximum !
+04.0  103    78.00   2959    3889   59572  12083     99.4    1.300  ! Near Maximum !
+05.0  104    78.75   2989    3967   61606  12151     99.5    1.280  ! Near Maximum !

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    75.00   2990    3969   63916  11441    100.0    1.266  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     99    75.00   2636    3085   40800  11355     91.8    1.537

There does appear to be considerable discrepancy between SAAMI standards and what you report.