280 Ackley Improved quickload

Nadawah · Tuesday at 12:59 PM

Can someone get me a quick load for a 280ackley improved out of a 22” barrel 1:9 twist using 140grain Accubonds? I have several powders including Ramshot Hunter , 6.5 Staball, 4831sc, Magpro. Thank you

DrMike · Tuesday at 1:26 PM

Code:

Cartridge          : .280 Ack Imp
Bullet             : .284, 140, Nosler AccuBond 59992
Useable Case Capaci: 66.211 grain H2O = 4.299 cm³
Cartridge O.A.L. L6: 3.330 inch = 84.58 mm
Barrel Length      : 22.0 inch = 558.8 mm
Powder             : Ramshot Hunter

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    56.16   2793    2425   46183  12220     97.2    1.210
-09.0   90    56.78   2824    2478   47719  12350     97.6    1.191
-08.0   91    57.41   2854    2533   49301  12474     97.9    1.173
-07.0   92    58.03   2885    2587   50934  12594     98.2    1.155
-06.0   93    58.66   2916    2643   52620  12709     98.5    1.138
-05.0   94    59.28   2946    2698   54361  12819     98.8    1.121
-04.0   95    59.90   2977    2755   56160  12923     99.0    1.104  ! Near Maximum !
-03.0   96    60.53   3007    2811   58018  13021     99.3    1.088  ! Near Maximum !
-02.0   97    61.15   3038    2868   59938  13114     99.4    1.072  ! Near Maximum !
-01.0   98    61.78   3068    2926   61922  13201     99.6    1.056  ! Near Maximum !
+00.0   99    62.40   3098    2984   63972  13283     99.7    1.040  ! Near Maximum !
+01.0  100    63.02   3128    3042   66091  13358     99.8    1.025  !DANGEROUS LOAD-DO NOT USE!
+02.0  101    63.65   3158    3100   68283  13427     99.9    1.010  !DANGEROUS LOAD-DO NOT USE!
+03.0  102    64.27   3188    3159   70549  13489    100.0    0.995  !DANGEROUS LOAD-DO NOT USE!
+04.0  103    64.90   3218    3218   72893  13545    100.0    0.981  !DANGEROUS LOAD-DO NOT USE!
+05.0  104    65.52   3247    3278   75318  13596    100.0    0.966  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba     99    62.40   3167    3119   70132  13058    100.0    1.000  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba     99    62.40   3014    2825   57870  13331     98.3    1.086  ! Near Maximum !

DrMike · Tuesday at 1:27 PM

Code:

Cartridge          : .280 Ack Imp
Bullet             : .284, 140, Nosler AccuBond 59992
Useable Case Capaci: 66.211 grain H2O = 4.299 cm³
Cartridge O.A.L. L6: 3.330 inch = 84.58 mm
Barrel Length      : 22.0 inch = 558.8 mm
Powder             : Accurate MAGPRO

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   96    62.37   2776    2395   43726  13033     88.9    1.238
-09.0   97    63.06   2813    2459   45383  13230     89.7    1.217
-08.0   98    63.76   2850    2524   47108  13422     90.4    1.195
-07.0   99    64.45   2887    2590   48906  13611     91.1    1.174
-06.0  100    65.14   2924    2658   50782  13794     91.8    1.154
-05.0  101    65.84   2961    2726   52741  13973     92.4    1.133
-04.0  103    66.53   2999    2796   54787  14146     93.1    1.114
-03.0  104    67.22   3036    2866   56924  14314     93.7    1.094  ! Near Maximum !
-02.0  105    67.91   3074    2938   59157  14476     94.3    1.075  ! Near Maximum !
-01.0  106    68.61   3112    3011   61494  14632     94.8    1.056  ! Near Maximum !
+00.0  107    69.30   3150    3085   63934  14781     95.4    1.037  ! Near Maximum !
+01.0  108    69.99   3188    3160   66475  14924     95.9    1.019  !DANGEROUS LOAD-DO NOT USE!
+02.0  109    70.69   3226    3236   69123  15059     96.4    1.001  !DANGEROUS LOAD-DO NOT USE!
+03.0  110    71.38   3265    3313   71891  15187     96.8    0.983  !DANGEROUS LOAD-DO NOT USE!
+04.0  111    72.07   3303    3391   74785  15308     97.2    0.966  !DANGEROUS LOAD-DO NOT USE!
+05.0  112    72.77   3341    3471   77814  15420     97.6    0.949  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba    107    69.30   3253    3289   71368  14930     98.0    0.990  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba    107    69.30   3034    2861   56810  14417     91.6    1.091  ! Near Maximum !

DrMike · Tuesday at 1:28 PM

Code:

Cartridge          : .280 Ack Imp
Bullet             : .284, 140, Nosler AccuBond 59992
Useable Case Capaci: 66.211 grain H2O = 4.299 cm³
Cartridge O.A.L. L6: 3.330 inch = 84.58 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   94    58.14   2737    2329   45098  11873     91.2    1.213
-09.0   95    58.79   2770    2386   46694  12037     91.9    1.193
-08.0   96    59.43   2804    2444   48335  12197     92.5    1.174
-07.0   97    60.08   2837    2502   50075  12354     93.0    1.154
-06.0   98    60.72   2871    2562   51866  12507     93.6    1.136
-05.0   99    61.37   2904    2622   53726  12656     94.1    1.117
-04.0  101    62.02   2938    2683   55662  12801     94.6    1.099  ! Near Maximum !
-03.0  102    62.66   2972    2745   57674  12941     95.1    1.081  ! Near Maximum !
-02.0  103    63.31   3006    2808   59769  13077     95.6    1.063  ! Near Maximum !
-01.0  104    63.95   3040    2872   61949  13208     96.1    1.046  ! Near Maximum !
+00.0  105    64.60   3074    2937   64205  13334     96.5    1.029  ! Near Maximum !
+01.0  106    65.25   3108    3002   66587  13455     96.9    1.013  !DANGEROUS LOAD-DO NOT USE!
+02.0  107    65.89   3142    3069   69053  13570     97.3    0.996  !DANGEROUS LOAD-DO NOT USE!
+03.0  108    66.54   3176    3136   71617  13680     97.6    0.980  !DANGEROUS LOAD-DO NOT USE!
+04.0  109    67.18   3210    3204   74283  13784     98.0    0.964  !DANGEROUS LOAD-DO NOT USE!
+05.0  110    67.83   3245    3272   77058  13882     98.3    0.949  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba    105    64.60   3158    3100   70551  13421     98.6    0.988  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba    105    64.60   2978    2756   58103  13082     93.4    1.076  ! Near Maximum !

DrMike · Tuesday at 1:30 PM

Code:

Cartridge          : .280 Ack Imp
Bullet             : .284, 140, Nosler AccuBond 59992
Useable Case Capaci: 66.211 grain H2O = 4.299 cm³
Cartridge O.A.L. L6: 3.330 inch = 84.58 mm
Barrel Length      : 22.0 inch = 558.8 mm
Powder             : Winchester 6,5 StaBall *T*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    58.77   2729    2316   45207  11128     99.2    1.214
-09.0   90    59.42   2759    2366   46755  11221     99.4    1.195
-08.0   91    60.08   2789    2418   48360  11309     99.6    1.176
-07.0   92    60.73   2818    2469   50023  11391     99.8    1.158
-06.0   93    61.38   2848    2521   51748  11467     99.9    1.140
-05.0   94    62.04   2877    2574   53536  11536     99.9    1.123
-04.0   95    62.69   2907    2626   55391  11599    100.0    1.105  ! Near Maximum !
-03.0   96    63.34   2936    2679   57316  11655    100.0    1.089  ! Near Maximum !
-02.0   97    63.99   2965    2733   59314  11709    100.0    1.072  ! Near Maximum !
-01.0   98    64.65   2994    2786   61389  11762    100.0    1.056  ! Near Maximum !
+00.0   99    65.30   3023    2840   63545  11813    100.0    1.039  ! Near Maximum !
+01.0  100    65.95   3051    2895   65784  11864    100.0    1.024  !DANGEROUS LOAD-DO NOT USE!
+02.0  101    66.61   3080    2949   68111  11914    100.0    1.008  !DANGEROUS LOAD-DO NOT USE!
+03.0  102    67.26   3109    3004   70532  11962    100.0    0.993  !DANGEROUS LOAD-DO NOT USE!
+04.0  103    67.91   3137    3060   73021  12010    100.0    0.978  !DANGEROUS LOAD-DO NOT USE!
+05.0  104    68.57   3166    3115   75668  12056    100.0    0.963  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba     99    65.30   3080    2950   69794  11607    100.0    1.001  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba     99    65.30   2951    2707   57627  12031     99.8    1.083  ! Near Maximum !

These shoiuld suggest where to focus your efforts. Welcome aboard. Let us know how these work out for you.