7 mm Blaser Magnum

[jagermeister]

Hi Folks, tried a search on the web for reloading data on this caliber with no luck...

Is there Anyone who could help ?

I think it should (still) be considered almost as a "custom" caliber...

Norma doesn't probably publish the data for some kinda agreement with Blaser, I'd assume...

TY

JM

 

[longrangehunter]

Norma does list it in their reloading book, but the data on one of the bullets was wrong if memory serves me well? I thought, know way could it produce that kind of velocity and yet have the lighter bullet going so much slower? Error as I remember, but I could be wrong.

 

[DrMike]

QuickLoad does provide data for the 7mm Blaser Magnum. I'm sure someone can run some numbers if you suggest a preference for bullet and powder selection. It is my understanding that the Blaser line of cartridges are to be released in North America in the near future. They are interesting to contemplate.

 

[jagermeister]

Yep, it looks like an interesting caliber, working with lower pressure and yet performing quite well.

Looking at the data (the few I have, so far...), it should place itself between the .284 Win. and the slightly more powerful 7 Rem.Mag.
Barrel twist rate offered should be in the same league as the .284, 1:10" that is....
It should perform well with the 162-168 grs. bullets, I'd say.

GUYS....if there's someone Who could run QUICKLOAD for me (based on the following data) I'd really appreciate .
Here we go :

26" - 1 in 10" twist barrel
Hornady A-Max 162 grs. bullet
Vihtavuori N160 Powder.

I am curious to see what comes up....and compare it to the other 7's !

TY
JM

 

[DrMike]

Cartridge          : 7 mm Blaser Mag
Bullet             : .284, 162, Hornady A-MAX 28402
Useable Case Capaci: 76.251 grain H2O = 4.951 cm³
Cartridge O.A.L. L6: 3.300 inch = 83.82 mm
Barrel Length      : 26.0 inch = 660.4 mm
Powder             : Vihtavuori N160

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    53.20   2417    2102   32552   9033     92.7    1.672
-18.0   81    54.53   2474    2201   34609   9297     93.7    1.633
-16.0   83    55.86   2530    2302   36789   9551     94.7    1.595
-14.0   85    57.19   2586    2405   39098   9796     95.6    1.550
-12.0   87    58.52   2642    2510   41545  10030     96.4    1.505
-10.0   89    59.85   2698    2617   44136  10252     97.1    1.463
-08.0   91    61.18   2753    2726   46882  10461     97.8    1.421
-06.0   93    62.51   2808    2837   49793  10657     98.3    1.382
-04.0   95    63.84   2863    2949   52878  10839     98.8    1.344  ! Near Maximum !
-02.0   97    65.17   2918    3063   56150  11005     99.2    1.307  ! Near Maximum !
+00.0   99    66.50   2972    3178   59622  11156     99.6    1.272  ! Near Maximum !
+02.0  101    67.83   3026    3295   63309  11291     99.8    1.237  !DANGEROUS LOAD-DO NOT USE!
+04.0  103    69.16   3080    3412   67226  11408     99.9    1.205  !DANGEROUS LOAD-DO NOT USE!
+06.0  105    70.49   3133    3531   71390  11507    100.0    1.173  !DANGEROUS LOAD-DO NOT USE!
+08.0  107    71.82   3186    3651   75821  11593    100.0    1.142  !DANGEROUS LOAD-DO NOT USE!
+10.0  109    73.15   3238    3772   80541  11675    100.0    1.113  !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    66.50   3082    3418   69616  10809    100.0    1.189  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     99    66.50   2817    2854   49720  11054     95.6    1.380

 

[SJB358]

Looks pretty similar to the 7mm Rem Mag actually.

Any idea on case capacity?

 

[DrMike]

Other possibilities:

Cartridge          : 7 mm Blaser Mag
Bullet             : .284, 162, Hornady A-MAX 28402
Useable Case Capaci: 76.251 grain H2O = 4.951 cm³
Cartridge O.A.L. L6: 3.300 inch = 83.82 mm
Barrel Length      : 26.0 inch = 660.4 mm

Predicted Data for Indicated Charges of the Following Powders.
Matching Maximum Pressure: 60000 psi, or 413 MPa
or a maximum loading ratio or filling of 110 %
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 !

32 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
---------------------------------  -----------------------------------------------------------------
Vihtavuori N570                    105.0     77.8     5.04    3181    97.6    60000   14476   1.260  ! Near Maximum !
ReloadSwiss RS 80                  108.1     82.5     5.34    3174    98.5    60000   14272   1.257  ! Near Maximum !
Alliant Reloder-33                 106.8     81.4     5.28    3168    97.9    60000   14308   1.262  ! Near Maximum !
Hodgdon Retumbo                    108.7     76.8     4.98    3147   100.0    60000   12705   1.253  ! Near Maximum !
PB Clermont PCL 517                 99.0     74.3     4.81    3113    99.9    60000   12762   1.259  ! Near Maximum !
Bofors RP30                        103.9     73.1     4.73    3112    99.9    60000   12972   1.276  ! Near Maximum !
Norma MRP 2                        103.9     73.1     4.73    3112    99.9    60000   12972   1.276  ! Near Maximum !
Norma 217                          110.0     76.1     4.93    3112   100.0    57256   13049   1.301  ! Near Maximum !
Hodgdon H870                       110.0     79.8     5.17    3112    98.5    57022   13863   1.293  ! Near Maximum !
Alliant Reloder-26                  93.0     70.3     4.56    3112   100.0    60000   12312   1.281  ! Near Maximum !
SNPE Vectan SP 12                   98.8     74.1     4.80    3111    99.9    60000   12732   1.260  ! Near Maximum !
Vihtavuori N560                     95.9     68.9     4.46    3108    99.5    60000   12994   1.265  ! Near Maximum !
Alliant Reloder-50                 110.0     83.6     5.42    3103    96.7    56234   14425   1.324  ! Near Maximum !
Accurate MAGPRO                     96.3     71.9     4.66    3102    98.7    60000   13151   1.272  ! Near Maximum !
Norma MRP                           94.1     69.0     4.47    3101   100.0    60000   12480   1.273  ! Near Maximum !
Alliant Reloder-25                 101.7     71.1     4.61    3100   100.0    60000   12013   1.263  ! Near Maximum !
IMR 7828                           100.4     68.5     4.44    3099    99.7    60000   12581   1.254  ! Near Maximum !
IMR 7828 SSC                        94.9     68.5     4.44    3099    99.7    60000   12581   1.254  ! Near Maximum !
ReloadSwiss RS 70                   91.5     68.5     4.44    3096   100.0    60000   12110   1.256  ! Near Maximum !
Hodgdon H1000                      105.2     73.1     4.74    3087    99.8    60000   12306   1.248  ! Near Maximum !
Raufoss RA15                        96.2     68.4     4.43    3079   100.0    60000   12395   1.271  ! Near Maximum !
Bofors RP5/NP ~approximation        96.2     68.4     4.43    3079   100.0    60000   12395   1.271  ! Near Maximum !
Alliant Reloder-22                  96.2     68.4     4.43    3079   100.0    60000   12395   1.271  ! Near Maximum !
Winchester WXR                      98.8     68.7     4.45    3079   100.0    60000   12420   1.271  ! Near Maximum !
Bofors RP15                         98.8     68.7     4.45    3079   100.0    60000   12420   1.271  ! Near Maximum !
Vihtavuori 24N41                   107.4     80.4     5.21    3065    92.3    60000   13134   1.254  ! Near Maximum !
Ramshot Magnum                      96.3     73.7     4.78    3061   100.0    60000   11837   1.269  ! Near Maximum !
Bofors RP5 NT ~approximation        99.7     71.4     4.63    3060    98.6    60000   12447   1.252  ! Near Maximum !
Rottweil R905                       97.6     68.1     4.41    3054    99.4    60000   12223   1.269  ! Near Maximum !
Alliant Reloder-19                  93.4     65.7     4.25    3040   100.0    60000   11844   1.265  ! Near Maximum !
Bofors RP14 ~approximation          94.1     66.2     4.29    3033    99.9    60000   11765   1.265  ! Near Maximum !
Alliant Reloder-23                  98.3     67.6     4.38    3027   100.0    60000   11111   1.283  ! Near Maximum !
Hodgdon H4831 SC                    94.8     67.4     4.37    3023    99.3    60000   11830   1.262  ! Near Maximum !
Hodgdon H4831                       98.6     67.4     4.37    3023    99.3    60000   11830   1.262  ! Near Maximum !
Bofors 12,7mmRA NC1214 Lot20115087 110.0     81.8     5.30    3022    89.3    56943   13671   1.336  ! Near Maximum !
Raufoss RA4                         91.7     64.4     4.17    3019    99.9    60000   11575   1.264  ! Near Maximum !
Bofors RP4 ~approximation           91.7     64.4     4.17    3019    99.9    60000   11575   1.264  ! Near Maximum !
Vihtavuori N170                    107.9     75.0     4.86    3015    96.1    60000   12350   1.284  ! Near Maximum !
Somchem S385                        93.6     66.5     4.31    2999   100.0    60000   11259   1.287  ! Near Maximum !
Rottweil R904                       92.6     64.2     4.16    2995    99.6    60000   11367   1.264  ! Near Maximum !
Winchester Supreme 780              92.4     68.5     4.44    2995    99.9    60000   11300   1.273  ! Near Maximum !
Lovex D100                         104.9     79.4     5.14    2990    92.9    60000   12133   1.273  ! Near Maximum !
Somchem S365                        90.1     63.0     4.08    2989   100.0    60000   10521   1.290  ! Near Maximum !
Vihtavuori N165                     98.6     68.6     4.44    2986   100.0    60000   11041   1.278  ! Near Maximum !
Accurate 3100                       96.4     67.8     4.39    2979   100.0    60000   10887   1.305  ! Near Maximum !
Lovex S071                         102.0     67.8     4.39    2979   100.0    60000   10887   1.305  ! Near Maximum !
Vihtavuori N160                     98.9     66.6     4.32    2978    99.6    60000   11171   1.268  ! Near Maximum !
IMR 4831                            93.0     62.6     4.05    2977   100.0    60000   10621   1.290  ! Near Maximum !
Somchem S361                        91.7     68.7     4.45    2966    99.3    60000   11197   1.277  ! Near Maximum !
Hodgdon US 869                     110.0     82.4     5.34    2958    90.6    53913   12793   1.329  ! Near Maximum !
Hodgdon 50BMG                      110.0     78.5     5.09    2954    86.4    53748   12883   1.327  ! Near Maximum !
Hodgdon Hybrid 100V                 91.0     61.9     4.01    2948   100.0    60000   10034   1.282  ! Near Maximum !

 

[jagermeister]

Sorry Doc I forgot to thank you....
Great help, as usual !

Besides, there may be a Friend of mine who's going for this chambering.... :wink:

JM

 

[Europe]

JM,

I am a fan of the Blaser rifles. They make a good product and are especially helpful to European rifle owners, where the number of rifles one can own can be less than one wants to own. A Blaser rifle with three different caliber barrels is considered one rifle.

As to their proprietary cartridges, everybody wants their own, like the Nosler 26 and now 28, Dakota, etc. We did not look at the 7, but we did look at the 338 and decided that it was basically the same as the 340 Weatherby and since we already owned a 340 Weatherby we decided not to get the 338 Blaser Magnum.

Now that Dr Mike has answered your original question about the 7mm Blaser Magnum, let me ask a different question. Which would you buy --the 7mm Blaser magnum, the 28 Nosler, the 7mm Weatherby or ?

 

[jagermeister]

JM,....

Now that Dr Mike has answered your original question about the 7mm Blaser Magnum, let me ask a different question. Which would you buy --the 7mm Blaser magnum, the 28 Nosler, the 7mm Weatherby or ?

Europe,
I've looked into the 7 Blaser as, to me, it seems one of the most "balanced" magnum commercially available in the 7 mm. class.
Based on the (few) data I have so far, I'd put it in-between the 7 SAUM and the 7 REM.MAG.
I am not looking for the fastest 7 mm. on Earth.
There are many faster 7 mm. than the Blaser.
28 Nosler, 7 W.by Mag, 7 RUM, just to name a few.... :mrgreen:
7 Blaser's case dimension tells me that Blaser didn't want to step into that "Race", as this case is shorter than the rest of Blaser Magnums (300, 338 and 375).
They could have easily gone with the same case, hence getting more velocity.
I "suspect" they wanted a more balanced round and as accurate as possible, despite losing some speed (which is still plenty anyway).

What kind of hunting would you do with the 338 Blaser/340 Weatherby ?

:wink:

 

[Europe]

I agree JM, it looks like a a nice caliber and as stated before I like Blaser.

The 340 is popular in the colonies and it is popular for a reason. You can easily hunt distance on such animals as Elk, Moose, Brown Bear. In Canada it works again on Elk, Moose and Brown Bear, but also Bison, Muskox and White Bear. It also works nicely in Africa for the larger plains game.

Best of luck to you and your friend on the purchase and reloading of the 7 Blaser, nice rifle/caliber