257 wby and N-160 data wanted

[25tikka]

I have a bunch of N-160 vhitavouri powder and would like to use it up in my 257 wby with 117 gr bullets. Any data available?? Nosler shows loads for 100 gr bullets and vhit has nothing published for the 257 wby. Looks like good velocity in the nosler 100's

 

[JasonYuke]

The only load data I could find was for N-165 from 62.0 to 66.0 grains.

The 257 wby is famous for IMR 4831

Good luck

 

[msiu.mpc]

Apparently the burn rate of the N160 is parallel that of the IMR 4831 according to Vihta Vuori's own burn rate chart on second page...

http://www.lapua.com/fileadmin/user_upload/esitteet/VihtavuoriInternationalReloguideJuly2008.pdf

Cross checking with Hornady's reloading manual, max load 117 gr bullet is 57.3 gr of IMR 4831 at 3100fps

 

[25tikka]

Thank for the info...I will post results