I'm using the Rimmed version in a O/U Rifle/Shotgun combo. Brass is very hard to come by and expensive. There is little advantage in it over the 222Rem Mag. If you still think you want something with a little larger capacity than the Rem Mag and still keep the small bolt face the wildcat 22-204 fills the bill. PTG has the 22-204 reamer (got mine there) and just punch out a 223 barrrel (worked well for me).
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