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The only ballistic information I was able to find on the 9mm rimfire shotshell comes from the current production brasscased Fiocchi 1-3/4-inch brass shell with a 1/4-oz. load of # 6, #7, #8, or #9 shot. Fiocchi lists a muzzle velocity of 600 fps and an impressive 87 foot pounds of energy. In comparison, the Winchester Super-X .410 2-1/2-inch load lists a half-ounce charge of shot with a muzzle velocity of 1225 fps.

According to an Edwardian English gun writer, the 9mm shotshell was certainly up to its intended purpose:

“With a mini-gun like this it is necessary to start thinking in feet rather than yards. This is not unreasonable for something that might be used around buildings and on farm trackways and lanes, which are only 12ft or so wide.

A starting point was 6ft from the muzzle. At this distance most of the shot was contained in a 3/4in hole. At 12ft the pattern was nice with a 3in circle and at 18ft there was still a good pattern.

At 24ft (eight yards) there was still the potential for bowling a rodent over, but by 30ft the small amount of shot was very thinly spread.”