hi guys i am new to forum and new to long range shooting. i have been shooting in the 600 yrd rang for a little over a year. i am making my own loads and was wondering what powder to use in my .308 i just built. its a mauser receiver with a .308 bull barrel at 20" long with a 10-1 twist. i am shooing match king 150gr bullets. thanks for the help i will post pictures of the build latter.