You got one of those multi-barrel Euro jobs ?
I'd be looking for the Norma brand, since it's boxer primed and in a pinch, can reload for it. I've seen some occcasionaly at gun shows. there's one coming up, in Red Deer, in a couple of weeks. All else fails, try asking these guys. You'll have to register, but most of them can understand English and I think it's less difficult to import from Europe, even if you have tom settle for empty brass.
http://www.wildundhund.de/438,4436/
Grizz