RE: 22-250 varmint rounds...
DBL, the .22-250 is a very fine varmint gun.....However, the range seems to be best with heavier bullets even if a bit of velocity is lost.
I recommend you get into reloading soon because the fruits of the .22-250 can often be highlighted by "rolling your own"
Until then any 55 grain bullet that shoots well in your Savage should suit your needs. If Federal makes some .22-250 loads with nosler's ballistic tips, I'd try them......but you don't have to pay a premium price to get a good shooting bullet.
For you're future reloading needs, try to stay with one manufacturer of ammo for now!!