Do you all have any good loads to share for the 308 Win/165 Nosler BT with N140 or N540??????

Which should I purchase N140 or N540?

I use speer 150 gn SPBT bullets with 42.5 gns of N140 in my 22" M-Bolt..... Mild load 1"-1.5" groups 200 yards.Tried the lowest charge approx 40 gn groups were much bigger tried over 42.5 gn again groups opened up.....

Dont know about your .308 but mine shoots 180 gn bullets best........?

Englander