really depends on the distance.
That's it, really. A lot of it is about wind-bucking. Are you wanting small groups at:
Yards / Examples of calibers that do the job well without overkill in noise/recoil:
--75-99 (.22 WMR)
--100-124 (.17 HMR)
--125-149 (.22 Hornet or .218 Bee)
--150-174 (.20 Calhoun Hornet, .17 Rem Fireball, Improved Hornet or Improved Bee)
--175-199 (.222 Rem, .221 Fireball)
--200-249 (.223 Rem, .22 PPC)
--250-299 (6mm PPC, .17 Rem)
--300+ (.22-250, .204 Ruger, .220 Swift)
--or more (.243 Win, 6mm Rem, 6mm BR)
yards?
Certainly my list is not an exact science - there's a lot of overlap - nor is it exhaustive, just a good rough guide to examples. Any caliber that is good out to "X" distance, is also gonna be very good at all distances shorter than that. But it's gonna be a bit more powder expense, noise/blast, and recoil than needed to get the job done at the shorter distances.