Unfortunately, I am nowhere near my books or reference material. That said, it does not surprise me that experimental and pre-production rifles would end up on this course. It is a method of providing real-time exposure for the new weapons in a controlled environment. Although the Canadian Army Overseas was engaged with the enemy one could not expect to wait for a report from the battlefront as they had other priorities.
However, a range in Canada, where the skill was taught, practised and honed, and a considerable number of shots were fired, allowed for valuable user reports which would be fed from the Sniper Course, through A10 School and up the chain.
Thanks for posting the picture. I wish I had it available when I wrote "Without Warning".
Clive