With the .308 any cup & core will do. The .257 will require gay, mono-metal, & expensive bullets.

But have if you're into wasting money to get the jod done the .257 may be for you.

1st Special Operations Wing 1975-1983
919th Special Operations Wing 1983-1985 1993-1994

"Manus haec inimica tyrannis / Ense petit placidam sub libertate quietem" ~Algernon Sidney~