Quickload request

[caribouhunter]

Hi.

finally completed my load development with my Carl Gustaf semin custom rifle
it shoots the 130 hornady SP in about 3/4" with new win brass and 1/2" with neck sized brass.
average velocity is 3140 fps

can someone with quickload run the numbers for me?
i’d like to see what it guess the pressure is at.

so here goes
winchester brass 69gr h20 capacity (fireformed and neck sized)
60 gr H4831SC
cci200 primer
3.285” oal (0.020” from rifling)
23" barrel

edit: temperature 20°F

let me know if other info is needed

thanks

 

[DrMike]

Cartridge?

 

[caribouhunter]

270 win.
sorry.

 

[DrMike]

Cartridge          : .270 Win. (SAAMI)
Bullet             : .277, 130, Hornady SP 2730
Useable Case Capaci: 63.509 grain H2O = 4.124 cm³
Cartridge O.A.L. L6: 3.285 inch = 83.44 mm
Barrel Length      : 23.0 inch = 584.2 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   95    55.98   2796    2256   44840  11375     91.2    1.228
-09.0   96    56.60   2830    2311   46435  11530     91.8    1.208
-08.0   97    57.22   2864    2367   48091  11683     92.4    1.188
-07.0   98    57.85   2898    2424   49812  11831     93.0    1.169
-06.0   99    58.47   2932    2481   51601  11976     93.5    1.150
-05.0  100    59.09   2966    2540   53461  12117     94.1    1.131
-04.0  101    59.71   3000    2599   55395  12255     94.6    1.113  ! Near Maximum !
-03.0  102    60.33   3035    2659   57407  12387     95.1    1.095  ! Near Maximum !
-02.0  103    60.96   3069    2719   59503  12516     95.6    1.077  ! Near Maximum !
-01.0  104    61.58   3104    2781   61685  12640     96.0    1.059  ! Near Maximum !
+00.0  105    62.20   3139    2843   63958  12758     96.5    1.042  ! Near Maximum !
+01.0  106    62.82   3173    2907   66328  12872     96.9    1.025  !DANGEROUS LOAD-DO NOT USE!
+02.0  107    63.44   3208    2971   68798  12981     97.3    1.009  !DANGEROUS LOAD-DO NOT USE!
+03.0  108    64.07   3243    3035   71377  13084     97.6    0.992  !DANGEROUS LOAD-DO NOT USE!
+04.0  109    64.69   3278    3101   74062  13181     98.0    0.976  !DANGEROUS LOAD-DO NOT USE!
+05.0  110    65.31   3313    3167   76856  13272     98.3    0.961  !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    105    62.20   3299    3142   76694  12771     99.7    0.965  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    105    62.20   2931    2479   52169  12117     89.2    1.142

 

[caribouhunter]

thanks Dr Mike
i was expecting a velocity closer to what i’m experiencing.

when i look at the 3139 fps velocity line, it reads 64000 psi
can i expect that this is about what the pressure is in my rifle, since it is the velocity i get?

 

[DrMike]

All else being equal, there will be a rough correlation between velocity and maximum chamber pressure. If you are getting ~3140 fps, it is likely that Pmax is ~64K psi.