.308 I use the 165 gr fusion loads
30/30 either 170 gr federal blue box or fusion. Have a mix of both in my ammo pouch, they shoot to same poi (at least close enough with iron sights)
300 savage I've gone to 180 gr federal blue box since remington dropped their 180 gr load. Have both federal and rem 150 gr on hand, but currently sighted in for the 180s
250 savage not a lot of factory choice - 100 gr remington express. I do have a stash of old 87 gr winchester super-x on hand too.