243 QL Request Dr. Mike

[George Foster]

243 Win
75 Sierra HP
Rem Case
2.685 COL
22" Barrel
RL 19 Powder

 

[DrMike]

Cartridge          : .243 Win.
Bullet             : .243, 75, Sierra HP 1510
Useable Case Capaci: 51.958 grain H2O = 3.374 cm³
Cartridge O.A.L. L6: 2.685 inch = 68.20 mm
Barrel Length      : 22.0 inch = 558.8 mm
Powder             : Alliant Reloder-19 *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   93    44.55   2988    1487   42210  11085     90.4    1.162
-09.0   94    45.05   3023    1522   43667  11237     91.0    1.144
-08.0   95    45.54   3058    1558   45174  11386     91.7    1.126
-07.0   96    46.04   3093    1594   46738  11531     92.3    1.109
-06.0   97    46.53   3129    1630   48359  11672     92.9    1.092
-05.0   98    47.03   3164    1667   50038  11810     93.5    1.075
-04.0   99    47.52   3199    1704   51780  11943     94.1    1.058  ! Near Maximum !
-03.0  100    48.02   3234    1742   53586  12072     94.6    1.042  ! Near Maximum !
-02.0  101    48.51   3270    1780   55460  12197     95.1    1.026  ! Near Maximum !
-01.0  102    49.01   3305    1819   57404  12317     95.6    1.010  ! Near Maximum !
+00.0  103    49.50   3340    1858   59423  12433     96.1    0.995  ! Near Maximum !
+01.0  104    50.00   3376    1898   61518  12544     96.6    0.980  !DANGEROUS LOAD-DO NOT USE!
+02.0  105    50.49   3411    1938   63690  12649     97.0    0.965  !DANGEROUS LOAD-DO NOT USE!
+03.0  106    50.99   3446    1978   65934  12749     97.4    0.950  !DANGEROUS LOAD-DO NOT USE!
+04.0  107    51.48   3481    2018   68255  12844     97.7    0.936  !DANGEROUS LOAD-DO NOT USE!
+05.0  108    51.98   3517    2059   70663  12933     98.1    0.921  !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    103    49.50   3435    1965   65257  12550     98.4    0.954  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba    103    49.50   3233    1741   53763  12161     92.8    1.040  ! Near Maximum !

Glad to help, George. Looks to be a stepper!

 

[George Foster]

Once again Dr. Mike Thank You!