Just FYI, Ruger doesn't chamber every caliber all the time. What they do is produce a run of rifles in one chambering, then drop it for a year or two, while they do others, then make another run, when they think its time again.
So, just because Ruger isn't making caliber x today, doesn't mean they won't be doing it in the future.
So, just because Ruger isn't making caliber x today, doesn't mean they won't be doing it in the future.