the 'emasculating' of the nasty (grrrr) military 303British rifles to a nice civilian non-303British happy peoples 'gun' (aaaaahhhhh rainbows and lollipops) involved the removal of the barrel, lopping of exactly 2 threads of the chamber end, then refitting(with associated machining to refit....
The 303 'Sporting' is actually listed as a french (go figure) design/chambering....the case length is 52.82mm compared to the 303British at 56.44.... difference is 3.62mm.(hold that thought)
Thread pitch on the LE is 14TPI, so one thread is 25.4/14 = 1.81mm...... two thread would be 2 x 1.81 = 3.62mm ('unhold' the thought)
There you have it....the Frenchies not only dropped their rifles twice.... but they then picked OURS up, and made the awesome round..... a bit less awesome..
So did the 'Aussie castrati 303' correspond to this 2 thread mod, or just 1 thread, which would result with about the 54+mm length??