QL for these ‘New Times’

frankm · Jan 9, 2021

I ve got a good load of 24 grs of H4895 with a 75 gr Hor hpbt for my 223 but not a lot of H4895 left and I d to keep some of it around.

Would someone mind running me a QL with the following inputs;

223
2.375 oal
75 gr Hor hpbt #2279c
H380 powder
24” barrel

I have about 4 pounds of H380 and I know years back there was some data for it in 223. I know it’s on the slow side but if I can get reasonable velocity and accuracy it’d allow me to have a steel shooting load at least! The way components are right now and for the foreseeable future might have to make due with what we have!

Thx in advance for any help.

DrMike · Jan 9, 2021

Code:

Cartridge          : .223 Rem. (SAAMI)
Bullet             : .224, 75, Hornady BTHP M 2279
Useable Case Capaci: 25.532 grain H2O = 1.658 cm³
Cartridge O.A.L. L6: 2.375 inch = 60.33 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : Hodgdon H380

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    22.59   2562    1093   38308   6574     90.4    1.321
-09.0   95    22.84   2591    1118   39646   6659     91.0    1.301
-08.0   96    23.09   2621    1144   41034   6742     91.6    1.281
-07.0   97    23.34   2651    1170   42476   6823     92.1    1.261
-06.0   98    23.59   2681    1197   43973   6902     92.7    1.241
-05.0   99    23.85   2711    1224   45528   6979     93.2    1.223
-04.0  100    24.10   2741    1251   47144   7054     93.7    1.204  ! Near Maximum !
-03.0  101    24.35   2771    1278   48823   7127     94.2    1.186  ! Near Maximum !
-02.0  102    24.60   2800    1306   50569   7198     94.6    1.167  ! Near Maximum !
-01.0  103    24.85   2830    1334   52384   7266     95.1    1.150  ! Near Maximum !
+00.0  104    25.10   2861    1363   54272   7332     95.5    1.132  ! Near Maximum !
+01.0  105    25.35   2891    1391   56237   7396     95.9    1.115  !DANGEROUS LOAD-DO NOT USE!
+02.0  106    25.60   2921    1421   58282   7456     96.3    1.098  !DANGEROUS LOAD-DO NOT USE!
+03.0  107    25.85   2951    1450   60413   7514     96.7    1.081  !DANGEROUS LOAD-DO NOT USE!
+04.0  109    26.10   2981    1480   62633   7570     97.0    1.065  !DANGEROUS LOAD-DO NOT USE!
+05.0  110    26.36   3011    1510   64946   7622     97.4    1.049  !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    104    25.10   3011    1510   65652   7349     99.4    1.047  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    104    25.10   2666    1184   43464   6967     87.9    1.244