ANYONE EVER TRY 55 GRAIN WITH VV540

[Deelayed]

All I can find is load data for I think 62 grains and up and all I have is 55 grain I just wanted to know if anybody has a any information on a good starting load for that weight of bullet with that type of powder or if it's even safe to do it is there a formula that i could use to determine the the starting load for a bullet that is five to six grains lighter than the starting projectile weight on the actual load data.?

[OpenSightsOnly]

Have tried N540 in 223 (AR set-up) using 80+ grain bullets. Very good results but a very expensive powder.

Go to the Vitha Vouri website for the reloading data.

[Deelayed]

Yeah I happened to come across some and I loaded some 3006 with it but every where I look the 556 /223 load data starts off with bullets in the high 60 grain weights . I decided to do a few with an average of the increments available then reversed it not to go past the lowest or highest in the spread . Then looked at comparable powders and checked that out too .

[ar15barrels]

All I can find is load data for I think 62 grains and up and all I have is 55 grain I just wanted to know if anybody has a any information on a good starting load for that weight of bullet with that type of powder or if it's even safe to do it is there a formula that i could use to determine the the starting load for a bullet that is five to six grains lighter than the starting projectile weight on the actual load data.?

Case fill seems to be a problem.

Cartridge          : .223 Rem. (SAAMI)
Bullet             : .224, 53, Hornady V-MAX BT 22265
Useable Case Capaci: 25.492 grain H2O = 1.655 cm³
Cartridge O.A.L. L6: 2.250 inch = 57.15 mm
Barrel Length      : 16.0 inch = 406.4 mm
Powder             : Vihtavuori N540

Predicted data by increasing and decreasing the given charge,
incremented in steps of 0.415% 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

-04.1  105    24.92   2809     929   44191  10084     90.9    0.841
-03.7  105    25.03   2823     938   44849  10139     91.1    0.835
-03.3  106    25.14   2837     947   45517  10193     91.4    0.829
-02.9  106    25.25   2851     956   46198  10247     91.7    0.824
-02.5  107    25.35   2865     966   46890  10300     91.9    0.818  ! Near Maximum !
-02.1  107    25.46   2879     975   47594  10352     92.2    0.813  ! Near Maximum !
-01.7  108    25.57   2893     985   48296  10404     92.4    0.807  ! Near Maximum !
-01.2  108    25.68   2907     994   49038  10456     92.7    0.802  ! Near Maximum !
-00.8  109    25.78   2921    1004   49778  10507     92.9    0.796  ! Near Maximum !
-00.4  109    25.89   2935    1014   50532  10557     93.1    0.791  ! Near Maximum !
+00.0  109    26.00   2949    1023   51300  10607     93.4    0.785  ! Near Maximum !
+00.4  110    26.11   2963    1033   52081  10656     93.6    0.780  ! Near Maximum !
+00.8  110    26.22   2977    1043   52876  10705     93.8    0.775  ! Near Maximum !
+01.2  111    26.32   2991    1053   53686  10753     94.1    0.770  ! Near Maximum !
+01.7  111    26.43   3005    1063   54509  10800     94.3    0.764  !DANGEROUS LOAD-DO NOT USE!
+02.1  112    26.54   3020    1073   55346  10847     94.5    0.759  !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    109    26.00   3127    1151   62360  10905     98.5    0.722  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    109    26.00   2728     876   41485   9801     84.5    0.865

Problem goes away with heavier bullets.

Cartridge          : .223 Rem. (SAAMI)
Bullet             : .224, 75, Hornady BTHP M 2279
Useable Case Capaci: 24.285 grain H2O = 1.577 cm³
Cartridge O.A.L. L6: 2.250 inch = 57.15 mm
Barrel Length      : 16.0 inch = 406.4 mm
Powder             : Vihtavuori N540

Predicted data by increasing and decreasing the given charge,
incremented in steps of 0.467% 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

-04.7   97    22.02   2411     968   43523   9962     95.5    0.982
-04.2   98    22.13   2423     978   44189  10014     95.7    0.975
-03.7   98    22.24   2435     988   44864  10066     95.9    0.969
-03.3   99    22.35   2447     998   45549  10117     96.1    0.962
-02.8   99    22.45   2460    1008   46245  10167     96.3    0.955
-02.3  100    22.56   2472    1018   46952  10217     96.5    0.948  ! Near Maximum !
-01.9  100    22.67   2484    1028   47670  10265     96.6    0.942  ! Near Maximum !
-01.4  101    22.78   2497    1038   48400  10314     96.8    0.935  ! Near Maximum !
-00.9  101    22.88   2509    1048   49142  10361     97.0    0.929  ! Near Maximum !
-00.5  102    22.99   2521    1058   49895  10408     97.2    0.922  ! Near Maximum !
+00.0  102    23.10   2533    1069   50662  10454     97.3    0.916  ! Near Maximum !
+00.5  103    23.21   2546    1079   51441  10499     97.5    0.909  ! Near Maximum !
+00.9  103    23.32   2558    1090   52232  10544     97.6    0.903  ! Near Maximum !
+01.4  103    23.42   2570    1100   53037  10588     97.8    0.897  ! Near Maximum !
+01.9  104    23.53   2583    1111   53855  10631     97.9    0.891  ! Near Maximum !
+02.3  104    23.64   2595    1121   54687  10673     98.1    0.884  !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    102    23.10   2662    1180   60817  10411     99.9    0.847  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    102    23.10   2365     931   40931   9966     90.5    1.005