Quickload Request - 450 Marlin & 300 gr. Speer Uni-Cor HP

[NYDAN]

The last time that I asked for this projection I had an error in the input data. Would someone be so kind as to run a quickload projection for me with the following inputs?

Caliber - 450 Marlin
Barrel Length - 24"
Bullet - 300 gr. Speer Uni-Cor HP (Speer no. 2482)
Powder - H4198
O.A.L - 2.525"
Overflow case capacity - 76.4 gr.

Thank you.

 

[DrMike]

Cartridge          : .450 Marlin
Bullet             : .458, 300, Speer JHP 2482
Useable Case Capaci: 60.456 grain H2O = 3.925 cm³
Cartridge O.A.L. L6: 2.525 inch = 64.14 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : Hodgdon H4198

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    42.40   1890    2379   25587   2916     83.4    1.556
-18.0   83    43.46   1933    2488   27128   3010     84.5    1.518
-16.0   85    44.52   1976    2600   28761   3103     85.6    1.481
-14.0   87    45.58   2019    2714   30490   3194     86.7    1.446
-12.0   89    46.64   2062    2831   32323   3284     87.7    1.411
-10.0   91    47.70   2105    2950   34268   3372     88.7    1.377
-08.0   93    48.76   2147    3072   36330   3458     89.6    1.345
-06.0   95    49.82   2190    3196   38520   3542     90.5    1.312
-04.0   97    50.88   2233    3322   40833   3623     91.4    1.279  ! Near Maximum !
-02.0   99    51.94   2276    3451   43276   3702     92.3    1.248  ! Near Maximum !
+00.0  101    53.00   2319    3582   45868   3778     93.0    1.218  ! Near Maximum !
+02.0  103    54.06   2362    3716   48628   3851     93.8    1.189  !DANGEROUS LOAD-DO NOT USE!
+04.0  105    55.12   2405    3851   51569   3921     94.5    1.160  !DANGEROUS LOAD-DO NOT USE!
+06.0  107    56.18   2447    3989   54705   3987     95.2    1.133  !DANGEROUS LOAD-DO NOT USE!
+08.0  109    57.24   2490    4130   58053   4050     95.8    1.107  !DANGEROUS LOAD-DO NOT USE!
+10.0  111    58.30   2533    4272   61631   4109     96.4    1.081  !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    53.00   2429    3930   53492   3838     97.8    1.143  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    101    53.00   2183    3174   38427   3580     85.7    1.313

 

[NYDAN]

Dr. Mike,

Thank you very much. This projection agrees with my observed results for this rifle. For example with 52.0 grains I measured a velocity of 2277 fps. This projection shows a velocity of 2276 fps with 51.94 grains.

Dan

 

[DrMike]

Amazing how precise mathematics can be when the appropriate parameters are employed. This is an amazing program. That would be a fine load, delivering a real wallop to anything hit by that bullet.

 

[SJB358]

Oh yeah, that 300 grain Speer at 2200 would be an awesome all rounder. I really like that bullet, usually accurate in most rifles I have tried it in..