Being that .223 brass is readily available and cheap, would it be possible to size the brass down to a .20 Tactical, and then fireform it in a .204 Ruger chamber? What is the parent case for the .204?
macca said:There is another option and that is the 204 laser which Trueflite in New Zealand make.It is a 204 formed on the 223 case. http://www.truefliteriflebarrels.co.nz/13544/4709.html
Give it a look.
Have a good one,
Macca