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Old 09-08-2013, 09:02   #17
steve4102
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Quote:
Originally Posted by PCJim View Post
Quite interesting charted data. I could help note that Quickload accurately predicted the OP's stated velocity.
Quickload can be very accurate. For example,

Ramshot data for the 223 Rem with 55gr Hornady FMJ list the following.

Code:
 55 HDY BT-FMJ Start=22.4 2,976fps, Max= 24.9 3,278fps 54,466psi, 2.200OAL , 24 inch barrel
Plug this into QL and we get this. Almost identical.

Code:
 Cartridge          : .223 Rem. (SAAMI)
Bullet             : .224, 55, Hornady FMJ-BT w/c 2267
Cartridge O.A.L. L6: 2.200 inch or 55.88 mm
Barrel Length      : 24.0 inch or 609.6 mm
Powder             : Ramshot X-Terminator

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   76    19.92   2655     861   28642   5567     90.4    1.303
-18.0   78    20.42   2717     902   30568   5729     91.6    1.269
-16.0   80    20.92   2779     943   32624   5885     92.7    1.237
-14.0   82    21.41   2841     986   34820   6034     93.8    1.205
-12.0   84    21.91   2903    1029   37140   6177     94.7    1.173
-10.0   86    22.41   2964    1073   39592   6312     95.6    1.140
-08.0   87    22.91   3025    1118   42205   6438     96.4    1.108
-06.0   89    23.41   3086    1163   44992   6556     97.2    1.078
-04.0   91    23.90   3147    1209   47965   6665     97.8    1.048  ! Near Maximum !
-02.0   93    24.40   3207    1256   51139   6764     98.4    1.020  ! Near Maximum !
+00.0   95    24.90   3267    1303   54529   6853     98.9    0.993  !DANGEROUS LOAD-DO NOT USE!
+02.0   97    25.40   3326    1351   58153   6931     99.3    0.966  !DANGEROUS LOAD-DO NOT USE!
+04.0   99    25.90   3385    1399   62028   6998     99.6    0.941  !DANGEROUS LOAD-DO NOT USE!
+06.0  101    26.39   3443    1448   66177   7053     99.8    0.916  !DANGEROUS LOAD-DO NOT USE!
+08.0  103    26.89   3501    1497   70623   7097    100.0    0.892  !DANGEROUS LOAD-DO NOT USE!
+10.0  105    27.39   3558    1546   75393   7129    100.0    0.869  !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     95    24.90   3402    1413   64891   6642    100.0    0.925  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     95    24.90   3079    1158   44461   6734     93.8    1.081
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Last edited by steve4102; 09-08-2013 at 09:05..
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