Yea but neither of them travel at 4300+ FPS. Although they do come close. 
 Dale    http://en.wikipedia.org/wiki/.223_WSSM
Dale,
In regards to the 220 Swift & 22-250................true.  One note though,  if used for Woodchucks,  IMO there is not a factory caliber from .224 down that tears up Woodchucks  more than a 220 Swift / 22-250.  In particular a 50 grain V Max at about 3800fps. 

  In fact, they tear them up like a .243 with light stuff.  Twenty,Seventeen calibers, .223's etc. really don't come close to the carnage.  
I have noted this for some time.  It was again confirmed this summer on another website with a thread / contest about woodchuck carnage.  The 22-250s, Swifts & .243's tore them up the worst.  Larger calibers were also used but, they lacked the explosiveness.
I don't care for the muzzle blast these days nor find it sporting for the majority of shots inside 300 yards.  But, the Swifts and 22-250s really make good woodchuck medicine and are often extremely accurate in a quality bolt action. 
Now some here are using the custom 1/7 - 1/8 fast twist 22-250's and very high BC bullets for there long range / low recoil long range Chuck rifles  

  Now...........that will chew up a barrel  
