257 115 TSX Quickload

[hoyt-6190]

Could I get someone to run a quickload for 257 Weatherby. 115 gr Barnes TSX. Fed 215 M. Norma/Wby Brass. IMR 7828SSC. COAL 3.17". Thanks.

 

[DrMike]

Cartridge          : .257 Weath. Mag
Bullet             : .257, 115, Barnes 'TSX' 30224
Useable Case Capaci: 76.071 grain H2O = 4.939 cm³
Cartridge O.A.L. L6: 3.170 inch = 80.52 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : IMR 7828 SSC

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    60.12   3004    2304   45240  14358     96.7    1.323
-09.0   84    60.79   3038    2357   46776  14518     97.1    1.302
-08.0   85    61.46   3072    2410   48352  14672     97.5    1.282
-07.0   86    62.12   3106    2464   49982  14820     97.9    1.262
-06.0   87    62.79   3140    2518   51671  14960     98.2    1.243
-05.0   88    63.46   3174    2573   53408  15094     98.6    1.224
-04.0   89    64.13   3208    2628   55195  15221     98.8    1.205  ! Near Maximum !
-03.0   90    64.80   3242    2684   57036  15341     99.1    1.187  ! Near Maximum !
-02.0   91    65.46   3276    2740   58936  15453     99.3    1.169  ! Near Maximum !
-01.0   92    66.13   3309    2796   60898  15557     99.5    1.151  ! Near Maximum !
+00.0   93    66.80   3343    2853   62924  15654     99.7    1.134  ! Near Maximum !
+01.0   94    67.47   3376    2910   65018  15742     99.8    1.117  !DANGEROUS LOAD-DO NOT USE!
+02.0   95    68.14   3409    2968   67180  15823     99.9    1.100  !DANGEROUS LOAD-DO NOT USE!
+03.0   96    68.80   3442    3026   69415  15895    100.0    1.084  !DANGEROUS LOAD-DO NOT USE!
+04.0   96    69.47   3475    3084   71724  15958    100.0    1.068  !DANGEROUS LOAD-DO NOT USE!
+05.0   97    70.14   3508    3142   74111  16014    100.0    1.052  !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    66.80   3489    3109   75440  15123    100.0    1.047  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     93    66.80   3133    2506   50741  15432     95.0    1.248

 

[rodell]

This is my favorite combination and has been the proverbial "death ray" for me.

 

[Pacobillie]

This is my favorite combination and has been the proverbial "death ray" for me.

What is the twist rate of your barrel? I have a Vanguard 2 with 1:10 in rate of twist and, although I have never tried the Barnes 115, i am under the impression that a faster rate of twist is required to stabilize those bullets. Am I wrong?

 

[Tjay]

Barnes recommendation
Twist Rate1:9" or Faster