Hi David:
Canada's regular army (Permanent Force) during the 20's and 30's was abysmally small... the regualr artillery was three field batteries in the RCHA Brigade (A- Quebec City, B- Kingston and C- Winnipeg). There was also an anti-aircraft battery and a howitzer battery. These regulars did all the trials and testing on new equipment and, unless returned to the manufacturer, the gear usually went to a pool in Petawawa for use by units training there.
There is lots of info in the book "Gunners of Canada" by Nicholson.
Some websites which might help:
http://www.gunner.ca/English/Great%20Gunners/plow.htm
http://www.artillery.net/English/history.htm
UBIQUE!
Mike