.308 Quick Load request

[magothy1]

No rush at all. Running 150 gr Partitions, 20" barrel Rem 700, IMR 4064, because I have it on hand. Looks like 46.8 gr was fairly accurate, curious what it's fps.

Thanks.

Steve

 

[TackDriver284]

It's hard to judge your actual speed without a chronograph. I can only give you a rough estimate.

Cartridge : .308 Win. (SAAMI)
Bullet : .308, 150, Nosler PART SP 16329
Useable Case Capaci: 50.085 grain H2O = 3.252 cm³
Cartridge O.A.L. L6: 2.800 inch = 71.12 mm
Barrel Length : 20.0 inch = 508.0 mm
Powder : IMR 4064

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   86    37.44   2236    1665   31395   7365     87.7    1.296
-18.0   88    38.38   2291    1748   33494   7604     88.9    1.260
-16.0   90    39.31   2345    1832   35709   7838     90.1    1.225
-14.0   92    40.25   2401    1919   38057   8065     91.2    1.190
-12.0   94    41.18   2456    2008   40561   8286     92.3    1.155
-10.0   97    42.12   2511    2100   43234   8500     93.3    1.121
-08.0   99    43.06   2566    2193   46086   8705     94.2    1.088
-06.0  101    43.99   2621    2289   49132   8901     95.1    1.056
-04.0  103    44.93   2676    2386   52388   9087     95.9    1.026
-02.0  105    45.86   2732    2485   55870   9263     96.6    0.997  ! Near Maximum !
+00.0  107    46.80   2787    2587   59599   9427     97.3    0.968  ! Near Maximum !
+02.0  109    47.74   2842    2690   63594   9580     97.9    0.941  !DANGEROUS LOAD-DO NOT USE!
+04.0  112    48.67   2897    2796   67880   9719     98.4    0.914  !DANGEROUS LOAD-DO NOT USE!
+06.0  114    49.61   2952    2903   72484   9845     98.9    0.889  !DANGEROUS LOAD-DO NOT USE!
+08.0  116    50.54   3007    3012   77438   9957     99.2    0.864  !DANGEROUS LOAD-DO NOT USE!
+10.0  118    51.48   3062    3123   82774  10053     99.5    0.840  !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    107    46.80   2913    2826   70463   9340     99.9    0.902  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    107    46.80   2621    2288   49083   9090     91.1    1.054

 

[magothy1]

Thanks for that. I'll check it on a chrony when I get time and weather.

It's curious, on the Nosler load data site it shows 48 gr IMR 4064 as max, running 2920 fps. That Quick Load says 46.8 as near max, 47.74 as over max dangerous. The Hodgdon data page says 47.7 as max for a 150 gr BT.

The 46.8 gr load didn't seem real jumpy, even out of that butt ugly short barrel rubber stock rifle....can you tell why I named it Mud Turtle ?

Again, thanks for the data, I appreciate you taking the time to run it for me.

Steve