RL-26 Powder and 300 RUM

DON · Apr 26, 2015

Has anyone tried this powder yet using 200 AB in your 300 RUM? I'm curious if there is any velocity gain over the RL-25 that I'm currently using. Where can one find load data on this new powder? My local gunsmith has RL-23 & RL-26 in stock.

Don

FOTIS · Apr 26, 2015

Keep in mind that most 300 RUMS sport a little freebore and Q/L does not compensate for this. This is why it's maxing out under 3k fps. Same holds true for the weatherbies and Q/L

Code:

Cartridge          : .300 Rem Ultra Mag
Bullet             : .308, 200, Nosler AccuBond 54618
Useable Case Capaci: 98.787 grain H2O = 6.414 cm³
Cartridge O.A.L. L6: 3.598 inch = 91.39 mm
Barrel Length      : 26.0 inch = 660.4 mm
Powder             : Alliant Reloder-26

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    79.20   2781    3435   49324  11524    100.0    1.500
-09.0   82    80.08   2808    3501   51013  11585    100.0    1.477
-08.0   83    80.96   2834    3567   52755  11646    100.0    1.454
-07.0   84    81.84   2860    3634   54551  11707    100.0    1.432
-06.0   84    82.72   2887    3700   56403  11766    100.0    1.411  ! Near Maximum !
-05.0   85    83.60   2912    3767   58313  11824    100.0    1.390  ! Near Maximum !
-04.0   86    84.48   2938    3834   60282  11882    100.0    1.369  ! Near Maximum !
-03.0   87    85.36   2964    3901   62314  11939    100.0    1.349  ! Near Maximum !
-02.0   88    86.24   2989    3968   64409  11995    100.0    1.330  !DANGEROUS LOAD-DO NOT USE!
-01.0   89    87.12   3015    4036   66570  12050    100.0    1.310  !DANGEROUS LOAD-DO NOT USE!
+00.0   90    88.00   3040    4104   68799  12104    100.0    1.291  !DANGEROUS LOAD-DO NOT USE!
+01.0   91    88.88   3065    4172   71100  12157    100.0    1.273  !DANGEROUS LOAD-DO NOT USE!
+02.0   92    89.76   3090    4241   73474  12210    100.0    1.255  !DANGEROUS LOAD-DO NOT USE!
+03.0   93    90.64   3115    4309   75924  12261    100.0    1.237  !DANGEROUS LOAD-DO NOT USE!
+04.0   93    91.52   3140    4378   78453  12311    100.0    1.219  !DANGEROUS LOAD-DO NOT USE!
+05.0   94    92.40   3165    4448   81065  12361    100.0    1.202  !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    88.00   3129    4349   82962  11753    100.0    1.196  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     90    88.00   2905    3747   54452  12614    100.0    1.424