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Each PIM has its own specs it seems. Here is a document. Check out at the bottom of page 5.
http://74.125.47.132/search?q=cache:mjveStXO6dAJ:www.juniper.net/techpubs/software/screenos/screenos6.0.0/rn_600_r1.pdf+ssg+550+max+bgroups&hl=en&ct=clnk&cd=1&gl=us