Quote:
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The section of rope would be inserted into the partly formed case, which was necked down after the Cordite went in."
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I don't have a link, sorry.. but I have seen a series of photographs taken at a British "ammo factory" during 1940.
Several tables of ladies, each with a tray of cases, base down. The ladies then inserted a "bundle" of "cordite sticks" and then cut them off flush with the case mouth, with a knife.
Each completed tray was then carried to another station where a press machine was used to neck the brass and seat the bullets.
One thing to be aware of, sporting rifles chambered in .303 British usually have chambers closer to published dimensions than British military rifles. IF so, normal case life may be expected.
Though there is no guarantee and you'll just have to see what the rifle in your hands actually does.
Also, along with the .303, 7.7 Jap, and 7.62x54R the .311-.312" bullets also work in the 7.65mm Argentinian (Belgian)