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I did not say that, the barrel date just indicates the earliest date the rifle could have been assembled, if anything i go with the date being the manufacture/acceptance date of the barrel & i go...

Yep look at your survey, the second half of B prefix have barrel dates in the second half of 1941/early 42, C prefix barrel dates are nearly all 1942 but most are on 41 actions, D prefix fall into...

The assembly of D prefixed rifles began end of 1942/beginning 1943

C99121
https://www.milsurps.com/images/imported/2015/06/TR42Lithy4-1.jpg

C99126...

https://www.milsurps.com/images/imported/2014/05/B69002b-1.jpg
https://www.milsurps.com/images/imported/2014/05/41LithyTM6-1.jpg

The change of the GR proof must have been later than 1940, both of these have 1941 dated receivers.
https://www.milsurps.com/images/imported/2014/05/B69002c-1.jpg...