6mm BR Norma - anyone willing to run QL numbers for me?

[bobnob]

G’day Gents,

For the time being I have discarded the idea of rechambering the Howa 243 and I’ve ordered a new 1-7” twist .243 barrel to go on an old Stainless Vanguard I’ve had salted away. (The Howa 243 shoots too well to mess with!)

I’m going to finish the barrel at 21 inches. Going to be a walking goat and pig rifle which will also be shot from the car a bit.

I’d really appreciate some help with Quickload if someone could run the numbers for me. The parameters, if anyone can help, are...

6mm BR Norma / Hornady 105g BTHP / OAL 3.32” / BR4 / Max Pressure 58000kpsi

The only powders of interest to me are the ADI ones in the right burn range. ie Varget, H4895, 8208XBR.

Can someone help? Many thanks to anyone who can.

If it makes it easier and more simple it’s H4895 I’m most interested in because that’s the stuff I always have in bulk.

 

[bobnob]

In any case I’ll post some real world results when I have the rifle in hand for those interested.

Thanks.

 

[DrMike]

Did you mean 2.32 in OAL? 3.32 inches would be a rather large cartridge.

 

[DrMike]

Cartridge          : 6 mm B.R. Norma
Bullet             : .243, 105, Hornady BTHP 2458
Useable Case Capaci: 34.032 grain H2O = 2.210 cm³
Cartridge O.A.L. L6: 2.440 inch = 61.98 mm
Barrel Length      : 21.0 inch = 533.4 mm
Powder             : Hodgdon VARGET

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   89    27.09   2452    1402   42401   8374     96.0    1.244
-09.0   90    27.39   2477    1431   43684   8468     96.4    1.227
-08.0   91    27.69   2503    1460   45005   8560     96.7    1.210
-07.0   92    27.99   2528    1490   46365   8650     97.1    1.193
-06.0   93    28.29   2553    1520   47766   8737     97.4    1.177
-05.0   94    28.60   2578    1550   49208   8823     97.7    1.161
-04.0   95    28.90   2603    1580   50694   8905     97.9    1.145  ! Near Maximum !
-03.0   96    29.20   2628    1610   52224   8985     98.2    1.130  ! Near Maximum !
-02.0   97    29.50   2653    1641   53801   9062     98.5    1.115  ! Near Maximum !
-01.0   98    29.80   2678    1672   55426   9137     98.7    1.100  ! Near Maximum !
+00.0   99    30.10   2703    1703   57101   9209     98.9    1.085  ! Near Maximum !
+01.0  100    30.40   2728    1735   58827   9278     99.1    1.071  !DANGEROUS LOAD-DO NOT USE!
+02.0  101    30.70   2752    1766   60606   9344     99.3    1.057  !DANGEROUS LOAD-DO NOT USE!
+03.0  102    31.00   2777    1798   62440   9407     99.4    1.043  !DANGEROUS LOAD-DO NOT USE!
+04.0  103    31.30   2802    1830   64333   9468     99.5    1.030  !DANGEROUS LOAD-DO NOT USE!
+05.0  104    31.61   2826    1863   66284   9525     99.7    1.016  !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    30.10   2809    1839   66757   8991    100.0    1.016  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     99    30.10   2558    1526   47634   9022     94.1    1.175


Cartridge          : 6 mm B.R. Norma
Bullet             : .243, 105, Hornady BTHP 2458
Useable Case Capaci: 34.032 grain H2O = 2.210 cm³
Cartridge O.A.L. L6: 2.440 inch = 61.98 mm
Barrel Length      : 21.0 inch = 533.4 mm

Predicted Data for Indicated Charges of the Following Powders.
Matching Maximum Pressure: 58000 psi, or 399 MPa
or a maximum loading ratio or filling of 112 %
These calculations refer to your specified settings in QuickLOAD 'Cartridge Dimensions' window.
C A U T I O N : any load listed can result in a powder charge that falls below minimum suggested
loads or exceeds maximum suggested loads as presented in current handloading manuals. Understand
that all of the listed powders can be unsuitable for the given combination of cartridge, bullet
and gun. Actual load order can vary, depending upon lot-to-lot powder and component variations.
USE ONLY FOR COMPARISON !

2 loads produced a Loading Ratio below user-defined minimum of 90%. These powders have been skipped.
Powder type          Filling/Loading Ratio  Charge    Charge   Vel. Prop.Burnt P max  P muzz  B_Time
                                      %     Grains    Gramm   fps     %       psi     psi    ms
---------------------------------  -----------------------------------------------------------------
ReloadSwiss RS 60                  104.0     34.2     2.22    2870   100.0    58000   10589   1.051  ! Near Maximum !
Elcho 17                           103.1     33.9     2.20    2853    99.8    58000   10500   1.055  ! Near Maximum !
Alliant Reloder-17                 103.1     33.9     2.20    2853    99.8    58000   10500   1.055  ! Near Maximum !
Somchem S365                       111.1     34.7     2.25    2842   100.0    58000   10070   1.061  ! Near Maximum !
Alliant Reloder-16                 110.7     33.8     2.19    2835    99.4    58000   10339   1.062  ! Near Maximum !
Alliant Reloder-26                 112.0     37.8     2.45    2830    97.4    53426   11521   1.090  ! Near Maximum !
ReloadSwiss RS 62                  107.3     35.3     2.29    2827    98.4    58000   10465   1.068  ! Near Maximum !
ReloadSwiss RS 70                  109.9     36.7     2.38    2825    95.8    58000   10983   1.055  ! Near Maximum !
PB Clermont PCL 511                104.5     34.9     2.26    2805    97.0    58000   10426   1.065  ! Near Maximum !
PB Clermont PCL 518                108.8     35.2     2.28    2804    96.6    58000   10452   1.064  ! Near Maximum !
Ramshot Hunter                     108.0     35.0     2.27    2804    97.0    58000   10410   1.065  ! Near Maximum !
Norma URP                          107.6     33.4     2.16    2798    98.6    58000   10153   1.070  ! Near Maximum !
Accurate 4350                      107.2     33.6     2.18    2798    98.6    58000   10169   1.083  ! Near Maximum !
Bofors RP19 ~approximation         107.7     33.4     2.17    2797    98.6    58000   10149   1.070  ! Near Maximum !
Hodgdon H414                       102.0     33.8     2.19    2796    96.1    58000   10344   1.068  ! Near Maximum !
Winchester 760                     102.0     33.8     2.19    2796    96.1    58000   10344   1.068  ! Near Maximum !
Vihtavuori N550                    104.4     33.5     2.17    2795    98.4    58000   10254   1.077  ! Near Maximum !
Norma MRP                          112.0     36.7     2.38    2780    94.3    52961   11102   1.099  ! Near Maximum !
Alliant Reloder-19                 112.0     35.1     2.28    2773    93.7    57410   10361   1.069  ! Near Maximum !
Hodgdon Hybrid 100V                110.6     33.6     2.17    2770    99.7    58000    9469   1.067  ! Near Maximum !
ADI AR 2209                        111.1     34.7     2.25    2768    93.4    58000   10245   1.061  ! Near Maximum !
Norma 203 old                       99.6     31.6     2.05    2757    99.8    58000    9539   1.094  ! Near Maximum !
Bofors RP3                          99.6     31.6     2.05    2757    99.8    58000    9539   1.094  ! Near Maximum !
Norma 204                          106.3     34.4     2.23    2756    93.5    58000   10064   1.066  ! Near Maximum !
Bofors RP4 ~approximation          109.8     34.4     2.23    2756    93.5    58000   10064   1.066  ! Near Maximum !
Raufoss RA4                        109.8     34.4     2.23    2756    93.5    58000   10064   1.066  ! Near Maximum !
IMR 4831                           112.0     33.6     2.18    2755    98.4    56101    9895   1.094  ! Near Maximum !
Rottweil R903                      101.8     31.6     2.05    2750    99.7    58000    9453   1.094  ! Near Maximum !
Bofors RP4 NT ~approximation       107.4     34.2     2.22    2749    95.7    58000    9897   1.076  ! Near Maximum !
Bofors RP14 ~approximation         112.0     35.1     2.28    2745    93.3    56076   10202   1.081  ! Near Maximum !
Hodgdon H380                        98.7     31.6     2.05    2743    98.2    58000    9686   1.088  ! Near Maximum !
Somchem S355                       101.6     31.2     2.02    2740    99.6    58000    9420   1.091  ! Near Maximum !
IMR 7828 SSC                       112.0     36.1     2.34    2739    90.1    54953   10516   1.084  ! Near Maximum !
Lovex S070                         106.4     33.0     2.14    2735    96.3    58000    9773   1.089  ! Near Maximum !
Somchem S385                       112.0     35.5     2.30    2733    94.8    56012    9990   1.095  ! Near Maximum !
Accurate 4064                       99.5     30.5     1.98    2732   100.0    58000    8943   1.116  ! Near Maximum !
Accurate 2520                       92.3     30.5     1.98    2731   100.0    58000    8943   1.098  ! Near Maximum !
Lovex D073.6                        94.4     30.5     1.98    2731   100.0    58000    8943   1.098  ! Near Maximum !
Winchester Supreme 780             110.2     36.4     2.36    2726    93.3    58000    9772   1.068  ! Near Maximum !
Rottweil R904                      110.3     34.1     2.21    2719    92.2    58000    9686   1.072  ! Near Maximum !
Lovex S065                         104.9     32.2     2.09    2716    97.4    58000    9488   1.091  ! Near Maximum !
SNPE Vectan SP 7                    93.0     31.3     2.03    2714    98.1    58000    9326   1.092  ! Near Maximum !
Accurate 2495                       93.6     28.7     1.86    2712   100.0    58000    8573   1.122  ! Near Maximum !
Hodgdon H4831 SC                   112.0     35.5     2.30    2706    90.1    56431    9840   1.080  ! Near Maximum !
ADI AR 2213                        112.0     35.5     2.30    2705    89.6    53818   10292   1.096  ! Near Maximum !
Vihtavuori N560                    112.0     35.9     2.33    2704    88.7    50738   10666   1.125  ! Near Maximum !
Bofors RP7                         103.3     31.8     2.06    2702    95.3    58000    9468   1.089  ! Near Maximum !
Rottweil R907                      103.3     31.8     2.06    2702    95.3    58000    9468   1.089  ! Near Maximum !
IMR 4007 SSC                       100.0     31.8     2.06    2702    95.3    58000    9461   1.089  ! Near Maximum !
Alliant Reloder-22                 112.0     35.5     2.30    2691    91.5    49837   10488   1.135
Raufoss RA15                       112.0     35.5     2.30    2691    91.5    49837   10488   1.135
Bofors RP5/NP ~approximation       112.0     35.5     2.30    2691    91.5    49837   10488   1.135
Rottweil R901                       93.0     27.7     1.80    2683   100.0    58000    8516   1.111  ! Near Maximum !
Somchem S361                       108.9     36.4     2.36    2682    90.9    58000    9407   1.084  ! Near Maximum !
Accurate MAGPRO                    112.0     37.4     2.42    2669    85.9    49553   10493   1.140
Ramshot Magnum                     112.0     38.3     2.48    2663    91.6    51777   10082   1.117  ! Near Maximum !
IMR 4955 Enduron                   112.0     34.2     2.21    2656    90.4    54772    9470   1.102  ! Near Maximum !



Cartridge          : 6 mm B.R. Norma
Bullet             : .243, 105, Hornady BTHP 2458
Useable Case Capaci: 34.032 grain H2O = 2.210 cm³
Cartridge O.A.L. L6: 2.440 inch = 61.98 mm
Barrel Length      : 21.0 inch = 533.4 mm
Powder             : Hodgdon H4895

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   83    26.19   2469    1421   42029   8556     97.3    1.261
-09.0   84    26.48   2494    1450   43277   8645     97.6    1.243
-08.0   85    26.77   2519    1479   44561   8730     97.9    1.226
-07.0   86    27.06   2544    1509   45880   8814     98.2    1.209
-06.0   87    27.35   2568    1538   47236   8894     98.4    1.193
-05.0   88    27.65   2593    1568   48630   8972     98.7    1.177
-04.0   89    27.94   2618    1597   50063   9047     98.9    1.162  ! Near Maximum !
-03.0   90    28.23   2642    1627   51536   9120     99.1    1.146  ! Near Maximum !
-02.0   91    28.52   2666    1658   53051   9190     99.3    1.131  ! Near Maximum !
-01.0   92    28.81   2691    1688   54609   9256     99.4    1.116  ! Near Maximum !
+00.0   93    29.10   2715    1719   56210   9320     99.6    1.102  ! Near Maximum !
+01.0   94    29.39   2739    1749   57858   9381     99.7    1.087  !DANGEROUS LOAD-DO NOT USE!
+02.0   95    29.68   2763    1780   59553   9438     99.8    1.073  !DANGEROUS LOAD-DO NOT USE!
+03.0   96    29.97   2787    1811   61296   9493     99.9    1.059  !DANGEROUS LOAD-DO NOT USE!
+04.0   96    30.26   2811    1842   63090   9544     99.9    1.046  !DANGEROUS LOAD-DO NOT USE!
+05.0   97    30.56   2835    1874   64936   9592    100.0    1.033  !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     93    29.10   2817    1850   66085   9003    100.0    1.028  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     93    29.10   2570    1540   46494   9259     95.5    1.198

 

[bobnob]

Many thanks Mike!