.270 Win and RL23

[morgaj1]

I would like to work up a load with 140gr Game Kings or Partitions over RL23, but can't find a powder range as reference. Anybody got some info?

 

[jeremy.b]

Edit2: Sorry, removed first link was for the 270 short mag. Alliant doesn't have load data for 140's it seems in 270 win. This is for a 150 NP though:

Alliant Powder - Reloader's Guide

www.alliantpowder.com

I can run a Quickload setup at SAMMI specs in a little bit to give you a range too.

Edit: See below for Quickload data for SAMMI spec 140 NP. Again, start low work up!

Cartridge          : .270 Win. (SAAMI)
Bullet             : .277, 140, Nosler PART SP 35200
Useable Case Capaci: 61.050 grain H2O = 3.964 cm³
Cartridge O.A.L. L6: 3.340 inch = 84.84 mm
Barrel Length      : 22.4 inch = 569.9 mm
Powder             : Alliant Reloder-23 *C *T

Predicted data by increasing and decreasing the given charge,
incremented in steps of 0.848% 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

-08.5   98    54.00   2728    2313   43434  11841     99.4    1.272
-07.6   99    54.50   2754    2357   44737  11918     99.6    1.254
-06.8  100    55.00   2780    2402   46083  11988     99.7    1.237
-05.9  101    55.50   2806    2447   47474  12054     99.8    1.220
-05.1  102    56.00   2832    2493   48909  12114     99.9    1.204
-04.2  103    56.50   2857    2538   50394  12169    100.0    1.187
-03.4  104    57.00   2883    2584   51928  12218    100.0    1.171
-02.5  104    57.50   2909    2630   53509  12263    100.0    1.155
-01.7  105    58.00   2934    2677   55152  12306    100.0    1.139
-00.8  106    58.50   2960    2723   56849  12349    100.0    1.124  ! Near Maximum !
+00.0  107    59.00   2985    2770   58604  12392    100.0    1.109  ! Near Maximum !
+00.8  108    59.50   3010    2817   60419  12433    100.0    1.094  ! Near Maximum !
+01.7  109    60.00   3035    2864   62296  12474    100.0    1.079  ! Near Maximum !
+02.5  110    60.50   3060    2912   64229  12513    100.0    1.065  ! Near Maximum !
+03.4  111    61.00   3085    2959   66221  12552    100.0    1.050  !DANGEROUS LOAD-DO NOT USE!
+04.2  112    61.50   3110    3007   68278  12591    100.0    1.036  !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    107    59.00   3053    2897   65510  12129    100.0    1.061  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba    107    59.00   2901    2615   52081  12665     99.7    1.164

 

[antelopedundee]

I usually start about 2 grains below the QL number. Helps to avoid primer pocket expansion I'm told. One can work up if necessary. So far I've not noticed any signs of excessive pressure from doing it that way.

 

[morgaj1]

Thank y'all!

 

[GunTruck]

RL23 in my 270 Winchester is my go to load. I use 140gr Accubonds or Trophy Bonded Tipped Bullets. In my 3 model 270,s I got

3044FPS, with the old model 70.

3094FPS with the new Sako A7

3057FPS in the old Vanguard S2 with 3000 rounds thru it. Take your pick.