Long Lee marked "for cordite only"

[Fred G.]

So, any LSA target rifle with a reference on the barrel or receiver indicating that Rifleite was used as a proof load would be an indication that that particular rifle was made and proofed before the use of Cordite was adopted? is there any timeline or approximate date of the change? Also, in the case of the stamping of Lee Speed on a receiver, is there an approximate date when that term was dropped as well? Thanks.