I understood what you meant, but the IMR-4064 and IMR-3031 are both medium burn rate powders and are very close in powder charges.
-IMR-3031 is an excellent powder, I use it in my T/C Encore 243 Winchester for varmint bullets and would also be good for his 308 Winchester.
H-4198 or IMR-4198, are better used for lighter 110 to 130 grain bullets, not so good for his 150 grain bullet.
-I use H-4198 in my T/C Encore 223 Remington, perfect for light varmint bullets.
Other good powders for the 308 Winchester and 150 gran bullets along with IMR-3031 and IMR-4064, would be H-4895, Varget, BL-C(2), IMR 4007, IMR 4320 & IMR 4895.
yooper77