Both are good rounds but like stated 22-250 is available just about anyplace you go. Some advice should be just disregarded. The 22-250 is heads above a 223. In like bullet weight just in factory offerings muzzle velocity is 340-425 fps in 55 & 50 gr bullets with a difference bullet drop at 400 yards 11 & 8.4 " . The 22-250 & Swift are two top performers at long range under almost any conditions.
I'm sure there are thousands of prairie dogs and woodchucks that would attest to this fact ,that is if they were still around.