Yup- it does have to be a 220 swift.    As for your comments, they are great cartridges.  I like everyone else has a .223.  I shoot it quite a bit,burned a little over 100 rounds yesterday 12-31-07.  I'm happy with it, averaging 5/8 groups all day long.    As for the 22-250.  I currently load rounds with my 243 to match that.  Shooting a tad better than the 223.  
The Cz 527.  Love them.  I have one in 22 hornet.  Sweet shooter!  On paper and critters.  Was amazed what it was able to do with the 35 V-max on a rabbit.
So as for the 220 Swift.  Yup!  With all of the calibers that I have.  Everyone else has them as well.  Or at least knows someone with them.  have yet to find anyone that has the 220 swift, many that I am finding have never heard of it.  
But as for the posting.  They are great rounds, just needing to be a little different on this next rifle