Using British ammunition would fix one of those problems, and how hard would it be for Canadian shipyards to turn out their own Liberty ships? Lord knows they built hundreds of smaller vessels.
I've got a book on order about the Canadian Merchant Marine in World War II, with an emphasis on it's convoy runs to England and Russia in 1940 and '41. I know that they had an insane amount of shipping capacity, much more than folks would think they would.
And the Canadian economy could handle more: we're talking about moving goods through
Halifax, here. You'd have to have more ships than I've ever seen in my life to be able to plug that port up.
...if they use British guns I don't see any reason why they don't use British ammunition.
Precisely.
Okay, so let's move beyond the "why" for the moment and go to the "what."
The Ram II was a good tank. The 6 pdr was a good gun even in 1944, but it wasn't the best. I've done some looking, and according to
An Illustrated Guide to World War II Tanks and Fighting Vehicles editted by Christopher Foss, seems to show that it could handle either the 75mm or 17 pdr, though probably nothing larger than that.
As they're in 21st Army Group in Normandy, we'll assume that the Canadians arm this new "Ram Mk. III" with the 17 pdr. Knowing the Canadian military supply situation like I do, they'd still end up going in with alot of Mk. IIs, so we could assume that perhaps the Armoured Divisions are armed with the Mk. II while the Brigades of II Canadian Corps are armed with the Mk. III.
How will they fare against the weaponry they'll find? Or suppose that instead of being sent to First Canadian Army in Normandy, they're sent to I Canadian Corps in Italy. How will they fare there?
What other changes are there?