Quick load needed 308 Win

[Alaska]

Need Quickload data for 308 Win

Win 748 powder
WW brass 159.9 grains weight of water 45.9gr
165gr Fail Safe
WLR primer

Thank you !

 

[DrMike]

I calculated this with standard parameters. Please recheck the case volume as the number you present is grossly under what would be anticipated. Use deoxygenated water and ensure that it forms a convex meniscus. Allow the water to sit uncovered overnight before carefully pipetting water into a tared case until you form the convex meniscus.

Cartridge          : .308 Win. (SAAMI)
Bullet             : .308, 165, Nosler CT FailSafe 53175
Useable Case Capaci: 47.453 grain H2O = 3.081 cm³
Cartridge O.A.L. L6: 2.800 inch = 71.12 mm
Barrel Length      : 22.0 inch = 558.8 mm
Powder             : Winchester 748

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   86    40.32   2502    2293   44574   7567     98.2    1.209
-09.0   87    40.77   2527    2340   45984   7635     98.4    1.195
-08.0   88    41.22   2553    2387   47441   7701     98.7    1.181
-07.0   89    41.66   2578    2435   48949   7764     98.9    1.167
-06.0   89    42.11   2603    2483   50509   7823     99.1    1.153
-05.0   90    42.56   2629    2532   52122   7880     99.3    1.139
-04.0   91    43.01   2654    2580   53792   7934     99.5    1.124  ! Near Maximum !
-03.0   92    43.46   2679    2630   55521   7984     99.6    1.109  ! Near Maximum !
-02.0   93    43.90   2704    2679   57307   8031     99.7    1.093  ! Near Maximum !
-01.0   94    44.35   2729    2729   59148   8075     99.8    1.078  ! Near Maximum !
+00.0   95    44.80   2754    2779   61047   8115     99.9    1.064  ! Near Maximum !
+01.0   96    45.25   2779    2829   63005   8152    100.0    1.049  !DANGEROUS LOAD-DO NOT USE!
+02.0   97    45.70   2804    2880   65028   8186    100.0    1.035  !DANGEROUS LOAD-DO NOT USE!
+03.0   98    46.14   2828    2931   67123   8216    100.0    1.021  !DANGEROUS LOAD-DO NOT USE!
+04.0   99    46.59   2853    2982   69291   8244    100.0    1.007  !DANGEROUS LOAD-DO NOT USE!
+05.0  100    47.04   2877    3033   71537   8271    100.0    0.994  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba     95    44.80   2809    2891   66962   7923    100.0    1.026  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba     95    44.80   2686    2644   55145   8219     98.8    1.107  ! Near Maximum !

When you get the new case volume, I'll be glad to recalculate.

 

[300WSM]

Love the failsafe bullet but it was erractic here in Pennsylvania and elsewhere when fired out of non magnums as well...

What are your goals with that out of curiosity

Thx

 

[Alaska]

Love the failsafe bullet but it was erractic here in Pennsylvania and elsewhere when fired out of non magnums as well...

What are your goals with that out of curiosity

Thx

It’s a medium range moose load here in Alaska in Bergara Ridge 22” 308 win. for the canoe trips here local. I use to have the old Winchester Load data on web but can’t seem to find it now for the Fail Safe. Yes the bullet is designed for heavy game. I think I will find my load of 748 somewhere between 44 to 45 grains.

 

[300WSM]

It’s a medium range moose load here in Alaska in Bergara Ridge 22” 308 win. for the canoe trips here local. I use to have the old Winchester Load data on web but can’t seem to find it now for the Fail Safe. Yes the bullet is designed for heavy game. I think I will find my load of 748 somewhere between 44 to 45 grains.

Good luck with your development.

 

[Alaska]

Found my old Fail Safe 308 Win load data after some digging on the net.

 

[Alaska]

The best group came in at 45.0 of W748 with WW Brass and WLR primer and 165 FS . The 42.0 was good but Vel was very low ……..a low node load. Thanks for the help. I will shoot again in the 40deg area this spring to evaluate temp difference.