IMR 7828 in 300 Win Mag

Code: 
Cartridge          : .300 Win. Mag.(SAAMI)
Bullet             : .308, 180, Swift A-Frame SS
Useable Case Capaci: 82.676 grain H2O = 5.368 cm³
Cartridge O.A.L. L6: 3.340 inch = 84.84 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : IMR 7828

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   90    66.96   2751    3024   47859  11664     95.6    1.233
-09.0   91    67.70   2779    3088   49163  11797     96.0    1.220
-08.0   92    68.45   2808    3151   50511  11927     96.4    1.207
-07.0   93    69.19   2837    3216   51901  12054     96.7    1.195
-06.0   94    69.94   2865    3281   53339  12178     97.1    1.182
-05.0   95    70.68   2894    3347   54825  12297     97.4    1.170  ! Near Maximum !
-04.0   96    71.42   2923    3414   56362  12413     97.7    1.158  ! Near Maximum !
-03.0   97    72.17   2951    3482   57952  12525     98.0    1.145  ! Near Maximum !
-02.0   98    72.91   2980    3550   59596  12633     98.3    1.133  ! Near Maximum !
-01.0   99    73.66   3009    3619   61297  12736     98.5    1.121  ! Near Maximum !
+00.0  100    74.40   3038    3689   63058  12835     98.8    1.109  ! Near Maximum !
+01.0  101    75.14   3067    3759   64879  12930     99.0    1.097  !DANGEROUS LOAD-DO NOT USE!
+02.0  102    75.89   3096    3830   66767  13019     99.2    1.085  !DANGEROUS LOAD-DO NOT USE!
+03.0  103    76.63   3125    3902   68721  13103     99.4    1.074  !DANGEROUS LOAD-DO NOT USE!
+04.0  104    77.38   3153    3975   70745  13183     99.5    1.062  !DANGEROUS LOAD-DO NOT USE!
+05.0  105    78.12   3182    4048   72843  13257     99.7    1.051  !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    100    74.40   3112    3872   68888  12733     99.9    1.078  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba    100    74.40   2952    3483   57627  12753     96.5    1.143  ! Near Maximum !
 
Code: 
Cartridge          : .300 Win. Mag.(SAAMI)
Bullet             : .308, 180, Nosler PART SP 16331
Useable Case Capaci: 81.823 grain H2O = 5.313 cm³
Cartridge O.A.L. L6: 3.340 inch = 84.84 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : IMR 7828

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    70.11   2775    3078   44340  12171     94.9    1.330
-09.0   97    70.89   2808    3152   45884  12317     95.5    1.309
-08.0   98    71.67   2841    3227   47484  12459     96.0    1.287
-07.0   99    72.45   2875    3303   49144  12596     96.4    1.267
-06.0  100    73.23   2908    3379   50868  12726     96.9    1.246
-05.0  101    74.01   2941    3457   52657  12852     97.3    1.227
-04.0  102    74.78   2974    3536   54515  12971     97.7    1.207  ! Near Maximum !
-03.0  103    75.56   3007    3615   56444  13084     98.0    1.188  ! Near Maximum !
-02.0  104    76.34   3041    3695   58449  13191     98.4    1.169  ! Near Maximum !
-01.0  105    77.12   3074    3776   60532  13292     98.7    1.150  ! Near Maximum !
+00.0  106    77.90   3107    3858   62697  13386     98.9    1.132  ! Near Maximum !
+01.0  107    78.68   3140    3940   64952  13473     99.2    1.114  !DANGEROUS LOAD-DO NOT USE!
+02.0  108    79.46   3173    4023   67297  13552     99.4    1.096  !DANGEROUS LOAD-DO NOT USE!
+03.0  109    80.24   3206    4107   69735  13625     99.6    1.079  !DANGEROUS LOAD-DO NOT USE!
+04.0  111    81.02   3238    4192   72276  13690     99.7    1.062  !DANGEROUS LOAD-DO NOT USE!
+05.0  112    81.80   3271    4277   74924  13748     99.8    1.045  !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    106    77.90   3189    4064   69431  13235     99.9    1.085  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba    106    77.90   3010    3621   56449  13323     96.6    1.185  ! Near Maximum !
 
I gave you the projection for the SP; here's the projection for the PP.

Code: 
Cartridge          : .300 Win. Mag.(SAAMI)
Bullet             : .308, 180, Nosler PART PP 25396
Useable Case Capaci: 83.336 grain H2O = 5.411 cm³
Cartridge O.A.L. L6: 3.340 inch = 84.84 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : IMR 7828

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   95    70.92   2780    3090   44346  12362     95.1    1.330
-09.0   96    71.71   2813    3163   45882  12510     95.6    1.309
-08.0   97    72.50   2846    3238   47476  12654     96.1    1.288
-07.0   98    73.28   2880    3314   49128  12791     96.6    1.267
-06.0   99    74.07   2913    3391   50843  12924     97.0    1.247
-05.0  100    74.86   2946    3468   52617  13050     97.4    1.227
-04.0  101    75.65   2979    3547   54468  13171     97.8    1.207  ! Near Maximum !
-03.0  102    76.44   3012    3626   56387  13285     98.1    1.188  ! Near Maximum !
-02.0  103    77.22   3045    3706   58377  13393     98.5    1.170  ! Near Maximum !
-01.0  104    78.01   3078    3786   60446  13495     98.7    1.151  ! Near Maximum !
+00.0  106    78.80   3111    3868   62597  13589     99.0    1.133  ! Near Maximum !
+01.0  107    79.59   3144    3950   64832  13677     99.2    1.115  !DANGEROUS LOAD-DO NOT USE!
+02.0  108    80.38   3177    4033   67157  13758     99.4    1.097  !DANGEROUS LOAD-DO NOT USE!
+03.0  109    81.16   3209    4117   69575  13831     99.6    1.080  !DANGEROUS LOAD-DO NOT USE!
+04.0  110    81.95   3242    4201   72093  13897     99.8    1.063  !DANGEROUS LOAD-DO NOT USE!
+05.0  111    82.74   3275    4286   74715  13955     99.9    1.046  !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    106    78.80   3192    4073   69330  13430    100.0    1.086  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba    106    78.80   3014    3632   56347  13532     96.7    1.186  ! Near Maximum !
 
There are a lot of great .308 caliber magnums, but the .300 Winchester Magnum has to rank high among the favorites. If I ever shoot the barrel out of my 7m/m Remington Magnum it will be re-barreled to a 300 Win Mag.
 
grry10 said:
There are a lot of great .308 caliber magnums, but the .300 Winchester Magnum has to rank high among the favorites. If I ever shoot the barrel out of my 7m/m Remington Magnum it will be re-barreled to a 300 Win Mag.
Click to expand...
Man, I just saw a video on here that proved the 300 WM was an over powered cartridge and too expensive to shoot. And that after two rounds from the bench, you will say "ouch". :sneaky: Sorry, couldn't resist.
 
It's tough to beat the 300 Win Mag. The round is inherently accurate, relatively easy to shoot and ample power for anything in North America.
Brass and factory ammunition are readily available, not to mention proven load data.

JD338
 
Have been looking through my notes and it looks like IMR 7828 was never the best performer-in my rifle or several others I loaded for. Sorry.
IMR 4350 and rl-22 seem to be the favorites. I know you didn’t ask about them. Rl-22 with the 180 A frame and original tbbc.

Quit shooting off the bench and get on the sticks!
 
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