N 560 in 270wsm

[nshunter]

I loaded up a couple rounds to try with a 140 grain hornady bthp, Winchester brass and wlrm primer. 60 grains is what I tried initially and only got in the high 2700 fops range. It was noticeably less recoil and noise compared to my usual loads using supreme 780, reloader 17, 22 and 4451. The vv site lists 60.6 as a max with a Barnes bullet. I'm wondering if anyone
Has any experience with N 560 in the 270 wsm?

 

[jimbires]

that looks very low according to quickload . it looks like you should be maxing out around 68.7 grains

Cartridge : .270 WSM
Bullet : .277, 140, Hornady BTSP 2735
Useable Case Capaci: 73.067 grain H2O = 4.744 cm³
Cartridge O.A.L. L6: 2.860 inch = 72.64 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : Vihtavuori N560 *C

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 80 54.96 2572 2056 32406 11272 89.0 1.545
-18.0 82 56.33 2639 2164 34662 11655 90.4 1.504
-16.0 84 57.71 2706 2276 37077 12025 91.7 1.464
-14.0 86 59.08 2773 2390 39664 12383 93.0 1.419
-12.0 88 60.46 2840 2508 42438 12725 94.2 1.374
-10.0 90 61.83 2908 2629 45401 13049 95.2 1.330
-08.0 92 63.20 2975 2752 48603 13356 96.2 1.289
-06.0 94 64.58 3043 2878 51997 13641 97.1 1.249
-04.0 96 65.95 3110 3007 55609 13905 97.8 1.210 ! Near Maximum !
-02.0 98 67.33 3177 3138 59471 14145 98.5 1.173 ! Near Maximum !
+00.0 100 68.70 3244 3271 63605 14360 99.0 1.138 !DANGEROUS LOAD-DO NOT USE!
+02.0 102 70.07 3310 3407 68032 14548 99.4 1.103 !DANGEROUS LOAD-DO NOT USE!
+04.0 104 71.45 3377 3544 72778 14709 99.7 1.070 !DANGEROUS LOAD-DO NOT USE!
+06.0 106 72.82 3442 3684 77871 14841 99.9 1.038 !DANGEROUS LOAD-DO NOT USE!
+08.0 108 74.20 3508 3825 83342 14942 100.0 1.007 !DANGEROUS LOAD-DO NOT USE!
+10.0 110 75.57 3572 3967 89226 15021 100.0 0.977 !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 100 68.70 3397 3587 76750 13944 100.0 1.049 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 100 68.70 3031 2857 50910 13985 93.3 1.254

 

[nshunter]

Yeah I figured their numbers were off but I wanted to have more information first. Thanks a lot!