QL Request 257 WBY 120gr A-Frame

Partisan · Jan 5, 2015

I tried searching for old threads for this but couldn't locate anything for the 120gr A-Frame...
Only published data I can find is Norma MRP...

257 Weatherby
120gr Swift A-Frame
IMR7828
Nosler Cases
CCI 250 primers
24" Barrel

Thanks in advance...

DrMike · Jan 5, 2015

Code:

Cartridge          : .257 Weath. Mag
Bullet             : .257, 120, Swift A-Frame SS
Useable Case Capaci: 77.053 grain H2O = 5.003 cm³
Cartridge O.A.L. L6: 3.170 inch = 80.52 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : IMR 7828

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   76    52.80   2636    1851   33852  12607     92.3    1.496
-18.0   78    54.12   2700    1942   36029  13001     93.5    1.462
-16.0   80    55.44   2764    2035   38342  13379     94.6    1.429
-14.0   82    56.76   2828    2131   40820  13741     95.6    1.396
-12.0   84    58.08   2892    2229   43457  14085     96.6    1.364
-10.0   86    59.40   2956    2329   46268  14407     97.4    1.332
-08.0   88    60.72   3021    2431   49260  14708     98.1    1.301
-06.0   90    62.04   3084    2535   52416  14985     98.7    1.266
-04.0   92    63.36   3148    2641   55751  15236     99.2    1.228  ! Near Maximum !
-02.0   94    64.68   3211    2748   59294  15460     99.6    1.193  ! Near Maximum !
+00.0   96    66.00   3274    2856   63062  15655     99.8    1.159  ! Near Maximum !
+02.0   98    67.32   3337    2966   67071  15820    100.0    1.126  !DANGEROUS LOAD-DO NOT USE!
+04.0   99    68.64   3398    3077   71338  15955    100.0    1.094  !DANGEROUS LOAD-DO NOT USE!
+06.0  101    69.96   3460    3189   75883  16079    100.0    1.063  !DANGEROUS LOAD-DO NOT USE!
+08.0  103    71.28   3520    3302   80727  16198    100.0    1.033  !DANGEROUS LOAD-DO NOT USE!
+10.0  105    72.60   3581    3416   85895  16313    100.0    1.005  !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     96    66.00   3410    3099   74936  15123    100.0    1.073  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     96    66.00   3079    2526   51294  15523     95.8    1.270

Code:

Cartridge          : .257 Weath. Mag
Bullet             : .257, 120, Swift A-Frame SS
Useable Case Capaci: 77.053 grain H2O = 5.003 cm³
Cartridge O.A.L. L6: 3.170 inch = 80.52 mm
Barrel Length      : 24.0 inch = 609.6 mm

Predicted Data for Indicated Charges of the Following Powders.
Matching Maximum Pressure: 63000 psi, or 434 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 !

45 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                     99.3     74.4     4.82    3336    97.8    63000   17832   1.177  ! Near Maximum !
Alliant Reloder-33                  99.7     77.8     5.04    3318    98.2    63000   17575   1.181  ! Near Maximum !
Hodgdon H870                       105.3     77.2     5.01    3309    99.1    63000   17172   1.183  ! Near Maximum !
Alliant Reloder-50                 105.2     80.8     5.24    3306    97.7    63000   17876   1.208  ! Near Maximum !
Hodgdon Retumbo                    103.0     73.5     4.77    3305   100.0    63000   15648   1.169  ! Near Maximum !
Norma 217                          104.9     73.4     4.76    3298   100.0    63000   16088   1.193  ! Near Maximum !
Vihtavuori N560                     91.4     66.3     4.30    3280    99.6    63000   16122   1.169  ! Near Maximum !
IMR 7828                            95.6     66.0     4.28    3273    99.8    63000   15652   1.159  ! Near Maximum !
IMR 7828 SSC                        90.4     66.0     4.28    3273    99.8    63000   15652   1.159  ! Near Maximum !
Accurate MAGPRO                     91.6     69.2     4.48    3270    99.0    63000   16302   1.179  ! Near Maximum !
Hodgdon H1000                      100.3     70.4     4.56    3262    99.9    63000   15287   1.155  ! Near Maximum !
Alliant Reloder-25                  96.4     68.1     4.41    3258   100.0    63000   14840   1.174  ! Near Maximum !
Accurate 8700                      110.0     81.5     5.28    3254    97.6    62828   16237   1.171  ! Near Maximum !
Alliant Reloder-22                  91.7     65.8     4.27    3250   100.0    63000   15359   1.174  ! Near Maximum !
Winchester WXR                      94.2     66.2     4.29    3250   100.0    63000   15387   1.175  ! Near Maximum !
Vihtavuori 24N41                   102.6     77.6     5.03    3244    93.1    63000   16404   1.161  ! Near Maximum !
Vihtavuori 20N29                   109.9     84.0     5.44    3243    95.6    63000   16631   1.187  ! Near Maximum !
Hodgdon 50BMG                      107.9     77.8     5.04    3237    89.4    63000   16709   1.170  ! Near Maximum !
Hodgdon US 869                     107.5     81.3     5.27    3227    93.2    63000   16401   1.177  ! Near Maximum !
Ramshot Magnum                      91.5     70.8     4.59    3223   100.0    63000   14653   1.179  ! Near Maximum !
Hodgdon H4831 SC                    90.9     65.3     4.23    3207    99.5    63000   14783   1.159  ! Near Maximum !
Hodgdon H4831                       94.6     65.3     4.23    3207    99.5    63000   14783   1.159  ! Near Maximum !
Vihtavuori N170                    103.2     72.5     4.70    3191    96.7    63000   15406   1.184  ! Near Maximum !
Vihtavuori N160                     95.0     64.7     4.19    3165    99.8    63000   14007   1.162  ! Near Maximum !
Vihtavuori N165                     94.4     66.3     4.30    3163   100.0    63000   13768   1.175  ! Near Maximum !
Accurate 3100                       91.9     65.3     4.23    3148   100.0    63000   13542   1.203  ! Near Maximum !

Partisan · Jan 6, 2015

Thanks Dr Mike.
Much appreciated. :grin:

Divernhunter · Jan 9, 2015

The Swift book; 120gr A-Frame-257Weatherby 24" barrel 1-10 twist CCI250 primers:
IMR7828 61.5gr-2926FPS----65.5grs-3114FPS
It also had the lowest standard deviation on velocity.

RL25--67.5grs-2955FPS-------71.5grs-3232FPS

My best hunting load was 71.5grs RL25 at 3.310" for 3241FPS Using Fed215 Primers SD 6 in my Vanguard.
Do not try 69gr IMR7828----Do not ask.
I do have a loading from guns & ammo mag article for 68grs of 7828. I need to try it.

SJB358 · Jan 13, 2015

I load that 120 A-Frame to 3150 in the 25-06. Pretty awesome bullet. Can't imagine another 150FPS on it..

Divernhunter · Jan 13, 2015

What load in the 25-06? I tried many and never got above 3000FPS.

SJB358 · Jan 13, 2015

I'll have to look at my book when I get home but it's RL22, WW case and probably CCIBR2's. It's out of a 24" M70 Sporter. Excellent shooter as well.

SJB358 · Jan 13, 2015

Divernhunter":2a3lssy7 said:
What load in the 25-06? I tried many and never got above 3000FPS.

I would bet some money my charge is in there, plus or minus a grain of RL22...

Cartridge : .25-06 Rem.
Bullet : .257, 120, Swift A-Frame SS
Useable Case Capaci: 60.689 grain H2O = 3.940 cm³
Cartridge O.A.L. L6: 3.250 inch = 82.55 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : Alliant Reloder-22

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 80 45.28 2532 1709 33682 10810 92.1 1.497
-18.0 82 46.41 2595 1794 35934 11142 93.3 1.459
-16.0 84 47.54 2658 1882 38346 11461 94.4 1.422
-14.0 86 48.68 2720 1972 40932 11767 95.4 1.386
-12.0 88 49.81 2783 2064 43694 12056 96.4 1.351
-10.0 90 50.94 2846 2158 46619 12327 97.2 1.316
-08.0 92 52.07 2908 2254 49718 12580 97.9 1.282
-06.0 94 53.20 2971 2351 53024 12812 98.6 1.244
-04.0 96 54.34 3033 2451 56557 13022 99.1 1.207 ! Near Maximum !
-02.0 98 55.47 3095 2552 60334 13208 99.5 1.171 ! Near Maximum !
+00.0 100 56.60 3156 2655 64375 13370 99.8 1.137 ! Near Maximum !
+02.0 102 57.73 3218 2759 68701 13506 99.9 1.104 !DANGEROUS LOAD-DO NOT USE!
+04.0 104 58.86 3278 2864 73336 13616 100.0 1.071 !DANGEROUS LOAD-DO NOT USE!
+06.0 106 60.00 3339 2970 78307 13709 100.0 1.040 !DANGEROUS LOAD-DO NOT USE!
+08.0 108 61.13 3399 3078 83643 13797 100.0 1.010 !DANGEROUS LOAD-DO NOT USE!
+10.0 110 62.26 3458 3186 89381 13881 100.0 0.981 !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 100 56.60 3289 2883 77062 12899 100.0 1.052 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 100 56.60 2966 2344 51904 13260 95.6 1.249