When our yardage ranges were changed to Metres we had to change the elevation slides on the sights as there was no corelation or do up dope charts. The POA used also had an impact. Civvie range shooting had the advantage of adjustable slides on the sights. Military sights did not they only had fixed marks. The only adjustment to zero was the front sight when changing POA.
Being a F Open shooter now days barrel harmonics and tuners with all sorts of tweak's with powder loads, seating depths to make accurate shooting shows to some degree how good the designers of the Lee Enfield system were.