QL request 6mm ARC 62000 PSI

[hunter24605]

Could somebody plug in:
6mm ARC (62000 psi bolt gun)
22" barrel
33.9 H20
75 hornady V-max
2.100 COAL
IMR 3031
Goal is for 100% burn and burnout well before muzzle to help reduce whiteout in the IR scope from muzzle flash and IR reflection on unburnt powder, yet still "slow" enough to generate good velocity.

 

[DrMike]

Cartridge          : 6 mm ARC
Bullet             : .243, 75, Hornady V-MAX 22420
Useable Case Capaci: 30.281 grain H2O = 1.966 cm³
Cartridge O.A.L. L6: 2.100 inch = 53.34 mm
Barrel Length      : 22.0 inch = 558.8 mm
Powder             : IMR 3031

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   96    25.11   2784    1290   36529   7379     96.4    1.161
-09.0   97    25.39   2814    1319   37734   7456     96.8    1.145
-08.0   98    25.67   2845    1348   38980   7530     97.2    1.128
-07.0   99    25.95   2876    1377   40272   7601     97.6    1.111
-06.0  101    26.23   2906    1407   41608   7668     97.9    1.095
-05.0  102    26.51   2937    1436   42992   7732     98.2    1.079
-04.0  103    26.78   2967    1466   44427   7793     98.5    1.063  ! Near Maximum !
-03.0  104    27.06   2997    1496   45912   7851     98.8    1.048  ! Near Maximum !
-02.0  105    27.34   3028    1527   47453   7904     99.0    1.033  ! Near Maximum !
-01.0  106    27.62   3058    1557   49050   7954     99.2    1.018  ! Near Maximum !
+00.0  107    27.90   3088    1588   50706   8000     99.4    1.003  ! Near Maximum !
+01.0  108    28.18   3118    1619   52425   8043     99.6    0.989  !DANGEROUS LOAD-DO NOT USE!
+02.0  109    28.46   3148    1650   54206   8082     99.7    0.975  !DANGEROUS LOAD-DO NOT USE!
+03.0  110    28.74   3177    1681   56055   8116     99.8    0.961  !DANGEROUS LOAD-DO NOT USE!
+04.0  111    29.02   3207    1713   57978   8147     99.9    0.947  !DANGEROUS LOAD-DO NOT USE!
+05.0  112    29.30   3236    1744   59971   8173    100.0    0.934  !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    107    27.90   3165    1668   56320   7839    100.0    0.962  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba    107    27.90   2995    1494   45541   8031     97.5    1.049  ! Near Maximum !

Doesn't quite make your goal of 100% burn, but it may be close enough to avoid significant muzzle flash.

If you are able to find AR-Comp, it may work for you.

Cartridge          : 6 mm ARC
Bullet             : .243, 75, Hornady V-MAX 22420
Useable Case Capaci: 30.281 grain H2O = 1.966 cm³
Cartridge O.A.L. L6: 2.100 inch = 53.34 mm
Barrel Length      : 22.0 inch = 558.8 mm
Powder             : Alliant AR-Comp *C *T

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   92    24.75   2785    1292   36624   7061     99.5    1.158
-09.0   93    25.03   2814    1319   37828   7109     99.6    1.141
-08.0   94    25.30   2843    1346   39074   7154     99.8    1.125
-07.0   95    25.58   2872    1374   40362   7195     99.9    1.109
-06.0   96    25.85   2901    1401   41692   7231    100.0    1.092
-05.0   97    26.13   2929    1429   43079   7264    100.0    1.077
-04.0   98    26.40   2958    1457   44510   7292    100.0    1.061  ! Near Maximum !
-03.0   99    26.68   2986    1485   45993   7319    100.0    1.046  ! Near Maximum !
-02.0  100    26.95   3014    1513   47529   7345    100.0    1.031  ! Near Maximum !
-01.0  101    27.23   3042    1541   49122   7371    100.0    1.017  ! Near Maximum !
+00.0  102    27.50   3069    1569   50772   7396    100.0    1.003  ! Near Maximum !
+01.0  103    27.78   3097    1597   52484   7421    100.0    0.988  !DANGEROUS LOAD-DO NOT USE!
+02.0  104    28.05   3124    1625   54259   7445    100.0    0.975  !DANGEROUS LOAD-DO NOT USE!
+03.0  105    28.33   3151    1654   56095   7468    100.0    0.961  !DANGEROUS LOAD-DO NOT USE!
+04.0  106    28.60   3178    1682   58014   7491    100.0    0.948  !DANGEROUS LOAD-DO NOT USE!
+05.0  107    28.88   3205    1711   59999   7514    100.0    0.935  !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    102    27.50   3132    1633   56401   7211    100.0    0.963  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba    102    27.50   2991    1489   45599   7607     99.9    1.047  ! Near Maximum !

 

[DrMike]

My deepest apologies: I didn't see the pressure increase you requested. That does change things, getting you to the condition you are seeking. Mia culpa.

Cartridge          : 6 mm ARC
Bullet             : .243, 75, Hornady V-MAX 22420
Useable Case Capaci: 30.281 grain H2O = 1.966 cm³
Cartridge O.A.L. L6: 2.100 inch = 53.34 mm
Barrel Length      : 22.0 inch = 558.8 mm
Powder             : IMR 3031

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  101    26.46   2932    1431   42766   7722     98.2    1.081
-09.0  103    26.75   2964    1463   44271   7787     98.5    1.065
-08.0  104    27.05   2996    1495   45832   7848     98.8    1.048
-07.0  105    27.34   3028    1527   47453   7904     99.0    1.033
-06.0  106    27.64   3059    1559   49139   7957     99.3    1.017
-05.0  107    27.93   3091    1591   50888   8005     99.4    1.001
-04.0  108    28.22   3123    1624   52702   8049     99.6    0.986  ! Near Maximum !
-03.0  109    28.52   3154    1657   54599   8089     99.7    0.972  ! Near Maximum !
-02.0  110    28.81   3185    1690   56564   8125     99.9    0.957  ! Near Maximum !
-01.0  112    29.11   3216    1723   58612   8156     99.9    0.943  ! Near Maximum !
+00.0  113    29.40   3247    1756   60742   8182    100.0    0.929  ! Near Maximum !
+01.0  114    29.69   3278    1790   62960   8204    100.0    0.915  !DANGEROUS LOAD-DO NOT USE!
+02.0  115    29.99   3309    1823   65262   8223    100.0    0.901  !DANGEROUS LOAD-DO NOT USE!
+03.0  116    30.28   3339    1857   67677   8241    100.0    0.888  !DANGEROUS LOAD-DO NOT USE!
+04.0  117    30.58   3370    1891   70185   8258    100.0    0.875  !DANGEROUS LOAD-DO NOT USE!
+05.0  118    30.87   3400    1925   72799   8274    100.0    0.862  !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    113    29.40   3318    1833   67627   7961    100.0    0.892  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba    113    29.40   3160    1663   54396   8330     99.0    0.970  ! Near Maximum !

 

[hunter24605]

Thanks Mike. It’s stepping along pretty well, to.