6mmBR quick load

wisconsinteacher · Dec 7, 2013

If anyone has a free second, could you run a quick load for 6mmBR?

Lapua Brass
107 Sierra bullet
Rem BR primer
Varget
28" barrel

Thanks

SJB358 · Dec 8, 2013

WT, let me know if this works.

Cartridge : 6 mm B.R. Rem
Bullet : .243, 107, Sierra HPBT MK 1570
Useable Case Capaci: 31.384 grain H2O = 2.038 cm³
Cartridge O.A.L. L6: 2.200 inch = 55.88 mm
Barrel Length : 28.0 inch = 711.2 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 83 23.20 2337 1298 32872 5169 94.4 1.664
-18.0 85 23.78 2389 1356 35015 5305 95.3 1.624
-16.0 87 24.36 2441 1416 37292 5435 96.1 1.584
-14.0 89 24.94 2493 1476 39695 5559 96.8 1.541
-12.0 91 25.52 2544 1538 42231 5676 97.4 1.499
-10.0 93 26.10 2595 1600 44927 5787 98.0 1.459
-08.0 95 26.68 2646 1663 47795 5890 98.5 1.420
-06.0 97 27.26 2697 1728 50847 5986 98.9 1.382
-04.0 99 27.84 2747 1792 54098 6074 99.3 1.346
-02.0 102 28.42 2797 1858 57563 6153 99.6 1.312 ! Near Maximum !
+00.0 104 29.00 2846 1925 61259 6224 99.8 1.278 ! Near Maximum !
+02.0 106 29.58 2895 1992 65204 6286 99.9 1.246 !DANGEROUS LOAD-DO NOT USE!
+04.0 108 30.16 2944 2059 69420 6338 100.0 1.215 !DANGEROUS LOAD-DO NOT USE!
+06.0 110 30.74 2993 2128 73931 6383 100.0 1.185 !DANGEROUS LOAD-DO NOT USE!
+08.0 112 31.32 3041 2196 78762 6425 100.0 1.156 !DANGEROUS LOAD-DO NOT USE!
+10.0 114 31.90 3088 2266 83943 6465 100.0 1.128 !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 29.00 2939 2053 71806 5980 100.0 1.204 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 104 29.00 2710 1745 50912 6258 96.5 1.377

wisconsinteacher · Dec 9, 2013

Thanks for the info. I hope to load some rounds soon.

steve4102 · Dec 9, 2013

Code:

 Cartridge          : 6 mm B.R. Rem
Bullet             : .243, 107, Sierra HPBT MK 1570
Cartridge O.A.L. L6: 2.200 inch or 55.88 mm
Barrel Length      : 28.0 inch or 711.2 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   83    23.20   2338    1298   32893   5169     94.4    1.664
-18.0   85    23.78   2390    1357   35037   5304     95.3    1.623
-16.0   87    24.36   2441    1416   37316   5434     96.1    1.584
-14.0   89    24.94   2493    1477   39722   5558     96.8    1.540
-12.0   91    25.52   2544    1538   42261   5676     97.4    1.499
-10.0   93    26.10   2596    1601   44959   5787     98.0    1.458
-08.0   95    26.68   2646    1664   47830   5890     98.5    1.419
-06.0   97    27.26   2697    1728   50886   5986     98.9    1.382  ! Near Maximum !
-04.0  100    27.84   2747    1793   54141   6073     99.3    1.346  ! Near Maximum !
-02.0  102    28.42   2797    1859   57610   6153     99.6    1.311  ! Near Maximum !
+00.0  104    29.00   2847    1925   61310   6223     99.8    1.278  !DANGEROUS LOAD-DO NOT USE!
+02.0  106    29.58   2896    1992   65261   6285     99.9    1.246  !DANGEROUS LOAD-DO NOT USE!
+04.0  108    30.16   2945    2060   69482   6337    100.0    1.215  !DANGEROUS LOAD-DO NOT USE!
+06.0  110    30.74   2993    2128   73999   6382    100.0    1.184  !DANGEROUS LOAD-DO NOT USE!
+08.0  112    31.32   3041    2197   78837   6424    100.0    1.155  !DANGEROUS LOAD-DO NOT USE!
+10.0  114    31.90   3089    2267   84027   6464    100.0    1.127  !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    29.00   2940    2053   71867   5979    100.0    1.204  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    104    29.00   2711    1746   50954   6258     96.5    1.377  ! Near Maximum !

Guy Miner · Dec 9, 2013

WT - you've been over to 6mmBR.com haven't you?

They've got the proven accuracy loads listed right there on the site. What a great little cartridge!

Guy

wisconsinteacher · Dec 9, 2013

I have been on that page. I am just trying to cover all my bases to get as much info as possible.

257 Ackley · Dec 11, 2013

Are you shooting the 6BR Remington or Norma? There is a slight difference in case capacity normally. My first 6BR was a remington that liked 30 grains of varget/107 SMK, with a 12 thousandths jump. The 6BR Norma i shoot now likes 30.4 grains of varget with 105 hybrids and 15 thousandths jump. I use CCI 450 primers for my 6BR and derivatives.