The CISC Handbook does not include 12" and 15" (310 mm and 80 mm)deep channels in the Mr tables. I want to find the Mr at Lu= 4 m. Is there a table around that does give the Mr for laterally unsupported steel channels of this depth, in accordance with the Canadian steel code CSA S16? Don't know why it was not included, since I understand these sizes are available in Canada (although probably imported from the U.S.).