Canadian Army Newsreels
Check out The War Amps YouTube page featuring the entire collection of Canadian Army Newsreels. https://www.youtube.com/playlist?list=PL04CC43B7CD63C686
I've found some relevant artillery clips here:
No. 6 - Six pounder firing on the range.
No. 16 - 25 pounder crash action demo.
No. 17 - Heavy Anti-Aircraft (Check out the fuze setter!).
No. 18 - Six pounder entering Campobasso pulled by a CMP.
Let me know if you find any additional segments that may be of interest.