I think you will be very happy with the 250 or the .223, I just love varmint rifles in general.
![Very Happy :D](./images/smilies/icon_biggrin.gif)
I am considering a .223 as well, it is a round that has stood the test of time, that is for sure.
Here are some size comparison photos, unfortunately I do not have a .223 to put in the picture.
Left to right, .17HMR(necked down .22 magnum), Ruger .204, 22-250 and the Swift.
![Image](http://img.photobucket.com/albums/v51/Pydpiper/P1210009.jpg)