Efficient load development

[bob_dobalina]

Maybe I should use a mag primer

 

[Dwh7271]

This should be pretty close to what you're seeing. Not exact, but close. I calibrated it to your 58 gr load
If you go up, check your chrono versus what the table shows it should be. If you're faster, let me know and we can rerun it. (faster means higher pressure than shown on here)

Cartridge          : .25-06 Rem.
Bullet             : .257, 100, Barnes 'TTSX'BT 30220
Useable Case Capaci: 59.131 grain H2O = 3.839 cm³
Cartridge O.A.L. L6: 3.166 inch = 80.42 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : Alliant Reloder-26 ?

Predicted data by increasing and decreasing the given charge,
incremented in steps of 0.833% 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

-08.3   94    55.00   3030    2038   41867  12486     96.1    1.261
-07.5   95    55.50   3061    2081   43122  12604     96.6    1.247
-06.7   96    56.00   3093    2125   44422  12717     97.0    1.233
-05.8   96    56.50   3125    2169   45768  12824     97.4    1.219
-05.0   97    57.00   3157    2213   47163  12926     97.8    1.205
-04.2   98    57.50   3189    2258   48609  13022     98.2    1.191
-03.3   99    58.00   3221    2304   50108  13111     98.5    1.176
-02.5  100    58.50   3253    2350   51661  13195     98.8    1.163
-01.7  101    59.00   3285    2396   53274  13272     99.1    1.147
-00.8  102    59.50   3317    2443   54947  13343     99.3    1.131
+00.0  102    60.00   3349    2490   56683  13406     99.5    1.114  ! Near Maximum !
+00.8  103    60.50   3381    2538   58486  13463     99.7    1.098  ! Near Maximum !
+01.7  104    61.00   3413    2586   60357  13513     99.8    1.083  ! Near Maximum !
+02.5  105    61.50   3444    2634   62302  13555     99.9    1.067  ! Near Maximum !
+03.3  106    62.00   3476    2683   64323  13590    100.0    1.052  ! Near Maximum !
+04.2  107    62.50   3508    2732   66425  13617    100.0    1.037  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba    102    60.00   3454    2648   63838  13144    100.0    1.061  ! Near Maximum !
Data for burning rate decreased by 5% relative to nominal value:
-Ba    102    60.00   3223    2307   50320  13375     97.1    1.173

 

[bob_dobalina]

Awesome thank you for doing that. I think what I'll do first is shoot a book load, an if I'm low on velocity on that too, I'm going to send my chrono into the manufacturer to get checked out. If I match, I'll run with your data.