Yes, as I read their posts Geno & Jim are in total agreement & both are right. If its bigger than a .410 it cannot be a 9mm. The 36 Gauge would certainly be an option as Geno pointed out.
This would of course be a "True" 36 gauge. I beleive that in the past some makers of the .410 labeled their guns as 36 gauge which was of course incorrect as was the 12mm label.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra