Interesting thread, Thanks.
After reading it and some other items on the internet, it seems the 3.7" worked it's way into an effective anti-tank roll as WW2 progressed and the allies gained air superiority. Several articles indicated quite significant quantities of AP and SAP 3.7" ammunition were produced and the one photo from Valcartier looks very much like the loader is holding a sabot AP round. The 3.7" was undoubtedly a brute to move around, particularly the later marks built on the sleeved down naval 4.5" gun. The tapered rifle grooves and addition of the shoulder guide band on the shell apparently gave the later mark 3.7 incredible accuracy as a ground support and anti tank gun and at an effective range far better than the 6, 17 and 25 pounders were capable of achieving. Must have been a real eye opener for the first German tank crews to encounter one!
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