Fiocchi makes 32 blanks. I've used them a bunch of times. They fit the 32 S&W revolvers I have, and they work in the 32 mag ruger single six I have as well.
They are labelled as "320" rimmed blanks. be careful not to order the 32acp.
http://www.shootnhunt.com/ammunition...s/0307349.html
http://www.cheaperthandirt.com/ItemL...spx?catid=1527
http://www.cheaperthandirt.com/ItemL...1527&mfgid=111
www.gunbroker.com search for "fiocchi blanks".
http://www.fiocchiusa.com
I believe you can order them directly as well, but I never have. I usually get them from Joe Swanson.
http://www.joeswansonsmotionpictureblanks.com/
If you contact Joe, he might even make blanks specifically for the Nagant.