I had a XR-100 in 204 Ruger when the brass was really tough to find had it converted to the 20 Practical and never looked bac. There is not enough difference between the 20's ( 204, Practical,Tach) to ever be seen in the "Real World" .
With the availability of 223 brass and the ease of forming it is a no Brainer.
Jim
+1
