308W, 215 Berger, N550/Varget, QL?

[280shooter]

Hi!

Developing a heavy load for my 308, using both Viht N550 and Varget. Could someone with QL please help me out here? Not a lot of data out there with the appropriate COAL.

308 Win, 26" barrel
215 Berger Hybrid
COAL 3.10"
Lapua brass

Viht N550 and Varget powder

Thanks in advance!

-280shooter

 

[DrMike]

Cartridge          : .308 Win. (SAAMI)
Bullet             : .308, 215, Berger Hybr G7 #30423
Useable Case Capaci: 47.761 grain H2O = 3.101 cm³
Cartridge O.A.L. L6: 3.100 inch = 78.74 mm
Barrel Length      : 26.0 inch = 660.4 mm
Powder             : Vihtavuori N550

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   83    37.36   2070    2045   31133   5996     94.7    1.775
-18.0   85    38.29   2119    2144   33273   6156     95.6    1.727
-16.0   87    39.23   2168    2244   35566   6309     96.5    1.680
-14.0   89    40.16   2217    2346   38023   6454     97.2    1.632
-12.0   91    41.10   2265    2450   40637   6590     97.9    1.585
-10.0   93    42.03   2314    2556   43410   6716     98.4    1.539
-08.0   96    42.96   2362    2664   46370   6832     98.9    1.494
-06.0   98    43.90   2410    2773   49539   6938     99.3    1.451
-04.0  100    44.83   2458    2884   52933   7032     99.6    1.410  ! Near Maximum !
-02.0  102    45.77   2505    2996   56570   7115     99.8    1.371  ! Near Maximum !
+00.0  104    46.70   2552    3110   60473   7186    100.0    1.333  ! Near Maximum !
+02.0  106    47.63   2599    3225   64664   7244    100.0    1.296  !DANGEROUS LOAD-DO NOT USE!
+04.0  108    48.57   2645    3341   69171   7296    100.0    1.260  !DANGEROUS LOAD-DO NOT USE!
+06.0  110    49.50   2691    3458   74025   7345    100.0    1.226  !DANGEROUS LOAD-DO NOT USE!
+08.0  112    50.44   2737    3577   79259   7392    100.0    1.193  !DANGEROUS LOAD-DO NOT USE!
+10.0  114    51.37   2783    3697   84913   7436    100.0    1.161  !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    46.70   2644    3337   72913   6866    100.0    1.244  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    104    46.70   2415    2784   48439   7294     96.9    1.454

Cartridge          : .308 Win. (SAAMI)
Bullet             : .308, 215, Berger Hybr G7 #30423
Useable Case Capaci: 47.761 grain H2O = 3.101 cm³
Cartridge O.A.L. L6: 3.100 inch = 78.74 mm
Barrel Length      : 26.0 inch = 660.4 mm
Powder             : Hodgdon VARGET

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   79    33.84   2041    1989   33404   5419     96.5    1.737
-18.0   81    34.69   2085    2076   35467   5553     97.2    1.695
-16.0   83    35.53   2129    2164   37652   5680     97.8    1.655
-14.0   85    36.38   2173    2254   39963   5800     98.3    1.610
-12.0   87    37.22   2216    2345   42410   5914     98.8    1.567
-10.0   89    38.07   2259    2436   45000   6021     99.2    1.526
-08.0   91    38.92   2302    2529   47742   6119     99.5    1.486
-06.0   93    39.76   2344    2623   50647   6210     99.7    1.449
-04.0   95    40.61   2386    2718   53725   6293     99.9    1.412  ! Near Maximum !
-02.0   97    41.45   2428    2814   56988   6367    100.0    1.377  ! Near Maximum !
+00.0   99    42.30   2469    2910   60450   6433    100.0    1.343  ! Near Maximum !
+02.0  101    43.15   2510    3007   64126   6494    100.0    1.310  !DANGEROUS LOAD-DO NOT USE!
+04.0  103    43.99   2550    3105   68030   6554    100.0    1.279  !DANGEROUS LOAD-DO NOT USE!
+06.0  105    44.84   2591    3204   72182   6612    100.0    1.248  !DANGEROUS LOAD-DO NOT USE!
+08.0  107    45.68   2631    3304   76600   6669    100.0    1.219  !DANGEROUS LOAD-DO NOT USE!
+10.0  109    46.53   2670    3404   81307   6723    100.0    1.191  !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     99    42.30   2540    3081   70480   6191    100.0    1.268  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     99    42.30   2362    2662   50566   6572     98.0    1.443

 

[280shooter]

Thanks a lot DrMike, this really helps!