RL-50

[redrider]

Have been working up loads with the M48 in 26 Nosler... I could not get this (my) rifle to shoot acceptable groups using US-869. Tried many bullet, powder weight, and COL
with this powder and just wouldn't group.....
Went to RL-50 and bang MOA groups
My load;
RL-50 75g
SGK 140 sp
Rem 9 1/2 M
COL 3.30

 

[JD338]

Way to hang in there and find a load.

JD338

 

[muleman]

redrider,
Glad you found an accurate load! It looks like you have plenty of room with that combo.

Cartridge          : .26 Nosler
Bullet             : .264, 140, Sierra SPBT 1730
Useable Case Capaci: 91.778 grain H2O = 5.959 cm³
Cartridge O.A.L. L6: 3.300 inch = 83.82 mm
Barrel Length      : 26.0 inch = 660.4 mm
Powder             : Alliant Reloder-50

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   66    60.00   2055    1313   18388  10088     74.7    2.204
-18.0   67    61.50   2110    1384   19558  10544     76.4    2.160
-16.0   69    63.00   2166    1458   20815  11003     78.2    2.118
-14.0   70    64.50   2223    1536   22167  11464     80.0    2.075
-12.0   72    66.00   2281    1617   23595  11925     81.7    2.033
-10.0   74    67.50   2339    1701   25097  12384     83.4    1.992
-08.0   75    69.00   2399    1789   26674  12839     85.0    1.951
-06.0   77    70.50   2459    1880   28337  13288     86.6    1.911
-04.0   79    72.00   2520    1974   30105  13729     88.1    1.872
-02.0   80    73.50   2581    2071   31983  14160     89.5    1.832
+00.0   82    75.00   2643    2171   33978  14580     90.9    1.794
+02.0   84    76.50   2705    2275   36096  14986     92.2    1.755
+04.0   85    78.00   2767    2381   38345  15376     93.4    1.708
+06.0   87    79.50   2830    2490   40732  15748     94.5    1.658
+08.0   89    81.00   2893    2602   43266  16101     95.6    1.609

Cartridge O.A.L. L6: 3.300 inch = 83.82 mm
Barrel Length      : 26.0 inch = 660.4 mm
Powder             : Alliant Reloder-50

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    69.60   2423    1825   27327  13019     85.6    1.935
-18.0   78    71.34   2493    1932   29314  13536     87.4    1.889
-16.0   80    73.08   2564    2043   31446  14040     89.1    1.843
-14.0   82    74.82   2635    2159   33732  14530     90.7    1.798
-12.0   84    76.56   2707    2279   36183  15002     92.2    1.754
-10.0   86    78.30   2780    2402   38811  15452     93.6    1.698
-08.0   87    80.04   2853    2530   41627  15878     94.9    1.640
-06.0   89    81.78   2926    2661   44646  16276     96.1    1.584
-04.0   91    83.52   2999    2796   47882  16644     97.1    1.530
-02.0   93    85.26   3073    2935   51355  16979     97.9    1.478
+00.0   95    87.00   3146    3076   55082  17278     98.7    1.428
+02.0   97    88.74   3219    3221   59084  17538     99.2    1.380  ! Near Maximum !
+04.0   99    90.48   3292    3368   63387  17757     99.6    1.334  ! Near Maximum !
+06.0  101    92.22   3364    3518   68016  17933     99.9    1.289  !DANGEROUS LOAD-DO NOT USE!
+08.0  103    93.96   3436    3670   73002  18063    100.0    1.246  !DANGEROUS LOAD-DO NOT USE!
+10.0  105    95.70   3507    3824   78378  18163    100.0    1.205  !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     95    87.00   3339    3467   68427  16833    100.0    1.288  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     95    87.00   2879    2577   42239  16489     91.2    1.616

RL50 is one of the better powders for the 140s and the 26Nosler. Let us know how your load development goes. It looks like you should see another accuracy node up around 87-88gr.
Scott