QL for .270 Win H4831SC

[Palouser]

Can anyone do a QL for 24" barrel and the 150 grain ABLR?
Thanks in advance!
Todd

 

[DrMike]

Can anyone do a QL for 24" barrel and the 150 grain ABLR?

No, they would need to have the latest data iteration. (Capt. Obvious)

Just joking. Here you go.

Cartridge          : .270 Win. (SAAMI)
Bullet             : .277, 150, Nosler Accubond LR 58836 G7
Useable Case Capaci: 58.520 grain H2O = 3.800 cm³
Cartridge O.A.L. L6: 3.340 inch = 84.84 mm
Barrel Length      : 22.0 inch = 558.8 mm
Powder             : Hodgdon H4831 SC

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   84    45.60   2276    1725   32104   9673     85.7    1.478
-18.0   86    46.74   2335    1817   34352  10017     87.2    1.439
-16.0   88    47.88   2396    1912   36764  10355     88.6    1.400
-14.0   90    49.02   2456    2010   39354  10685     89.9    1.354
-12.0   92    50.16   2518    2111   42138  11005     91.1    1.310
-10.0   94    51.30   2579    2215   45134  11315     92.3    1.268
-08.0   96    52.44   2641    2323   48360  11612     93.4    1.227
-06.0   98    53.58   2703    2433   51840  11895     94.5    1.188
-04.0  100    54.72   2765    2547   55597  12163     95.4    1.151  ! Near Maximum !
-02.0  102    55.86   2828    2663   59660  12414     96.3    1.114  ! Near Maximum !
+00.0  105    57.00   2891    2783   64060  12647     97.1    1.079  ! Near Maximum !
+02.0  107    58.14   2953    2905   68831  12860     97.8    1.044  !DANGEROUS LOAD-DO NOT USE!
+04.0  109    59.28   3017    3031   73990  13052     98.4    1.011  !DANGEROUS LOAD-DO NOT USE!
+06.0  111    60.42   3080    3159   79582  13220     98.9    0.979  !DANGEROUS LOAD-DO NOT USE!
+08.0  113    61.56   3143    3291   85669  13365     99.3    0.948  !DANGEROUS LOAD-DO NOT USE!
+10.0  115    62.70   3207    3425   92311  13483     99.7    0.918  !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    57.00   3033    3064   76721  12573     99.9    0.999  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    105    57.00   2704    2435   52239  12089     90.3    1.180

 

[Palouser]

Thanks Doc, you are the best! Does it matter that I have a 24" barrel?

 

[DrMike]

Thanks Doc, you are the best! Does it matter that I have a 24" barrel?

Add between 50 and 70 fps to muzzle velocity.

 

[6mm Remington]

You might give this a shot in your load work-up too. When I was working up a load for my buddies .270 with H4831SC my gunsmith suggested I use Federal 215 mag primers in working up the load. It worked and was simple to get a very good load for his rifle. It certainly does not require magnum primers, but in colder temperatures it may make the load more consistent. He's very happy with his load. Just a thought. Sometimes primers can make a huge difference on how a load groups.

 

[Palouser]

Thanks David and Dr. Mike! I have never had a magnum, but they have the same primer pocket size as standard primers? I could use a magnum primer in standard 270 Win cases?
Thanks for the info!

 

[gerry]

They are exactly the same size so no problems there, you may have a slightly lower charge of powder compared to standard primers but there also may be no difference in getting to max loads. If you work up carefully just like any other load you will be fine.

 

[Palouser]

Thanks Gerry. I'll try them.