257 WBY & RL 26 quick load

[hoyt-6190]

Just wondering if I could get a quickload run for the 257 WBY, RL 26, 215m primers, Norma/WBY Brass, and 110 Accubonds and 115 Partitions.

 

[DrMike]

Run with a 24 inch barrel:

Cartridge          : .257 Weath. Mag
Bullet             : .257, 110, Nosler AccuBond 53742
Useable Case Capaci: 76.606 grain H2O = 4.974 cm³
Cartridge O.A.L. L6: 3.170 inch = 80.52 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : Alliant Reloder-26 *C

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   82    62.37   3070    2302   44678  14599     99.8    1.345
-09.0   83    63.06   3105    2354   46253  14695     99.9    1.323
-08.0   84    63.76   3139    2407   47880  14780    100.0    1.302
-07.0   85    64.45   3173    2459   49561  14855    100.0    1.281
-06.0   86    65.14   3207    2512   51296  14928    100.0    1.260
-05.0   87    65.84   3241    2565   53088  15000    100.0    1.240
-04.0   88    66.53   3274    2618   54939  15071    100.0    1.220  ! Near Maximum !
-03.0   89    67.22   3307    2672   56852  15141    100.0    1.201  ! Near Maximum !
-02.0   89    67.91   3340    2725   58827  15210    100.0    1.182  ! Near Maximum !
-01.0   90    68.61   3373    2779   60868  15278    100.0    1.163  ! Near Maximum !
+00.0   91    69.30   3406    2833   62977  15344    100.0    1.145  ! Near Maximum !
+01.0   92    69.99   3438    2887   65156  15410    100.0    1.127  !DANGEROUS LOAD-DO NOT USE!
+02.0   93    70.69   3471    2942   67409  15474    100.0    1.110  !DANGEROUS LOAD-DO NOT USE!
+03.0   94    71.38   3503    2997   69737  15538    100.0    1.093  !DANGEROUS LOAD-DO NOT USE!
+04.0   95    72.07   3535    3052   72144  15600    100.0    1.076  !DANGEROUS LOAD-DO NOT USE!
+05.0   96    72.77   3567    3107   74634  15661    100.0    1.059  !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     91    69.30   3542    3065   77021  14836    100.0    1.049  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     91    69.30   3196    2495   49016  15908     99.2    1.277

Cartridge          : .257 Weath. Mag
Bullet             : .257, 115, Nosler PART SP 16318
Useable Case Capaci: 77.120 grain H2O = 5.007 cm³
Cartridge O.A.L. L6: 3.170 inch = 80.52 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : Alliant Reloder-26 *C

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   81    61.65   3003    2303   44369  14609     99.9    1.375
-09.0   82    62.34   3036    2354   45900  14701    100.0    1.353
-08.0   82    63.02   3069    2406   47479  14783    100.0    1.332
-07.0   83    63.71   3102    2457   49108  14861    100.0    1.310
-06.0   84    64.39   3135    2509   50789  14938    100.0    1.290
-05.0   85    65.08   3167    2561   52523  15014    100.0    1.269
-04.0   86    65.76   3199    2613   54313  15089    100.0    1.250  ! Near Maximum !
-03.0   87    66.45   3231    2666   56159  15163    100.0    1.230  ! Near Maximum !
-02.0   88    67.13   3263    2718   58064  15237    100.0    1.211  ! Near Maximum !
-01.0   89    67.82   3294    2771   60030  15309    100.0    1.193  ! Near Maximum !
+00.0   90    68.50   3325    2824   62060  15380    100.0    1.174  ! Near Maximum !
+01.0   91    69.19   3357    2877   64154  15450    100.0    1.156  !DANGEROUS LOAD-DO NOT USE!
+02.0   91    69.87   3388    2931   66317  15519    100.0    1.139  !DANGEROUS LOAD-DO NOT USE!
+03.0   92    70.56   3419    2984   68549  15587    100.0    1.121  !DANGEROUS LOAD-DO NOT USE!
+04.0   93    71.24   3449    3038   70855  15654    100.0    1.104  !DANGEROUS LOAD-DO NOT USE!
+05.0   94    71.93   3480    3092   73236  15719    100.0    1.088  !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     90    68.50   3456    3050   75645  14884    100.0    1.077  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     90    68.50   3125    2494   48516  15964     99.4    1.308

 

[hoyt-6190]

Thanks. 24” tube gives me a good starting point and should see a little more velocity with a 26”.

 

[DrMike]

Maximum chamber pressure will be identical regardless of battel length.

Cartridge          : .257 Weath. Mag
Bullet             : .257, 115, Nosler PART SP 16318
Useable Case Capaci: 77.120 grain H2O = 5.007 cm³
Cartridge O.A.L. L6: 3.170 inch = 80.52 mm
Barrel Length      : 26.0 inch = 660.4 mm
Powder             : Alliant Reloder-26 *C

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   81    61.65   3080    2422   44369  13301    100.0    1.430
-09.0   82    62.34   3113    2474   45900  13372    100.0    1.407
-08.0   82    63.02   3145    2526   47479  13442    100.0    1.385
-07.0   83    63.71   3178    2578   49108  13511    100.0    1.363
-06.0   84    64.39   3210    2631   50789  13580    100.0    1.342
-05.0   85    65.08   3242    2683   52523  13648    100.0    1.321
-04.0   86    65.76   3273    2736   54313  13714    100.0    1.301  ! Near Maximum !
-03.0   87    66.45   3305    2789   56159  13780    100.0    1.281  ! Near Maximum !
-02.0   88    67.13   3336    2842   58064  13845    100.0    1.262  ! Near Maximum !
-01.0   89    67.82   3367    2896   60030  13909    100.0    1.243  ! Near Maximum !
+00.0   90    68.50   3398    2949   62060  13971    100.0    1.224  ! Near Maximum !
+01.0   91    69.19   3429    3003   64154  14033    100.0    1.205  !DANGEROUS LOAD-DO NOT USE!
+02.0   91    69.87   3460    3057   66317  14094    100.0    1.187  !DANGEROUS LOAD-DO NOT USE!
+03.0   92    70.56   3490    3111   68549  14154    100.0    1.170  !DANGEROUS LOAD-DO NOT USE!
+04.0   93    71.24   3521    3166   70855  14213    100.0    1.152  !DANGEROUS LOAD-DO NOT USE!
+05.0   94    71.93   3551    3220   73236  14271    100.0    1.135  !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     90    68.50   3524    3172   75645  13521    100.0    1.124  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     90    68.50   3206    2624   48516  14578     99.7    1.361

 

[DrMike]

Cartridge          : .257 Weath. Mag
Bullet             : .257, 110, Nosler AccuBond 53742
Useable Case Capaci: 76.606 grain H2O = 4.974 cm³
Cartridge O.A.L. L6: 3.170 inch = 80.52 mm
Barrel Length      : 26.0 inch = 660.4 mm
Powder             : Alliant Reloder-26 *C

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   82    62.37   3148    2421   44678  13304    100.0    1.399
-09.0   83    63.06   3183    2474   46253  13373    100.0    1.376
-08.0   84    63.76   3217    2527   47880  13440    100.0    1.354
-07.0   85    64.45   3250    2580   49561  13505    100.0    1.332
-06.0   86    65.14   3284    2634   51296  13570    100.0    1.312
-05.0   87    65.84   3317    2687   53088  13634    100.0    1.291
-04.0   88    66.53   3350    2741   54939  13696    100.0    1.271  ! Near Maximum !
-03.0   89    67.22   3383    2795   56852  13758    100.0    1.251  ! Near Maximum !
-02.0   89    67.91   3415    2849   58827  13819    100.0    1.231  ! Near Maximum !
-01.0   90    68.61   3448    2904   60868  13879    100.0    1.212  ! Near Maximum !
+00.0   91    69.30   3480    2958   62977  13938    100.0    1.194  ! Near Maximum !
+01.0   92    69.99   3512    3013   65156  13996    100.0    1.175  !DANGEROUS LOAD-DO NOT USE!
+02.0   93    70.69   3544    3068   67409  14052    100.0    1.157  !DANGEROUS LOAD-DO NOT USE!
+03.0   94    71.38   3576    3123   69737  14108    100.0    1.140  !DANGEROUS LOAD-DO NOT USE!
+04.0   95    72.07   3607    3179   72144  14163    100.0    1.123  !DANGEROUS LOAD-DO NOT USE!
+05.0   96    72.77   3639    3234   74634  14216    100.0    1.106  !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     91    69.30   3612    3186   77021  13476    100.0    1.096  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     91    69.30   3278    2625   49016  14537     99.6    1.328

 

[Guy Miner]

Woo Hoo! The 257 Weatherby is still a hot rod!

 

[mjcmichigan]

Lightening in a little brass shell. Wow!


Sent from my iPhone using Tapatalk

 

[JD338]

That will be a flat liner.

JD338

 

[hoyt-6190]

Well the results with these two combos was a bust I’m sure if any creedmoor and prc shooters read this they will cringe that I literally will be seen as wasting precious rl26 that they cant find.

 

[wbyfan1]

Well the results with these two combos was a bust I’m sure if any creedmoor and prc shooters read this they will cringe that I literally will be seen as wasting precious rl26 that they cant find.

Try H-1000 with the 110AB

and RL-25 with the 115NPT.

These combos were fantastic in my 257 Wby.

 

[2ATexan]

Well the results with these two combos was a bust I’m sure if any creedmoor and prc shooters read this they will cringe that I literally will be seen as wasting precious rl26 that they cant find.

Can you elaborate please? I was just going to start working up some loads in 257 Wby Mag with RL26, 100 grain Partition, Triple Shock X and Sirocco bullets and 120 grain Partitions. I was going to compare RL33, IMR 7828SSC and Accurate MagPro as well. Maybe you can prevent me from going down a path I'll regret.

 

[hoyt-6190]

Just didn’t find the accuracy I was looking for everything at 100 was greater than 1.25”.

 

[frankm]

For what it’s worth my 26” Rem 700 257 WB shot R26 sub moa. BUT, I was using 3.40” oal with both the 110 AB and 115 BT. I had shot R22 previously and had found the long oal was where my rifle liked it. (Seated as long as I was comfortable with to insure adequate neck tension.

Dr Mike’s QL seems right in line with what I was getting. 69 grs R26 w/115 BT gave 3400 FPS. 71 grs R26 w110 AB went 3530 but it was too warm. Shot good, sub-moa, but gonna back it down and try 69- to maybe 70 grs. It’s plenty fast!!

Good luck; and work up as each rifle is an individual.

 

[frankm]

If you try R33 and do velocity and accuracy testing please share. I ve got some R33 but haven’t tried it…. Questioned if there was any room for improvement. Not sure I can shoot well enough to see!

 

[RL338]

I’ve been working on my 257 WBY again with 100gr TTSXs this time. RL26 is just too fast for me in this cartridge. I came up with a good load with N570 , it’s a full case though.
With the Hornady 120gr HPs I run RL33 , good stuff there.