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Question, I am bussy with this 20 pdr APDS cutaway model. However, the shellcase below it has a short No.17 primer with magazine. On your picture I see the cutaway has a long primer No.37 with magazine.
In the pamphlet below:
The latest publication I have is 1961 and only covers upto the L5 primer. It confirms however, that the non-practice round only used the No. 37 primer. The only practice shot to use the No. 37 was the Mark 1, which also used large granular propellant.
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