The ejector screw is only used when a live round is being extracted from the chamber of the # 4 Lee-Enfield.
The spend or "empty" case is solely being ejected by the ejector spring. What happens is, when the spend case is being pullet rearwards by the bolt and reach the charger clip thump cutout along the raceway, it also relieve the cartridge rim pressure against the racesway, and the force alone from the ejector spring will eject the spend or empty case.
After discovering this unique # 4, Lee-Enfield ejection system, I debated this discovery in these fine pages a while back.
Therefore, if a spend case refuse to be ejected, the problem must be in a weak ejector spring.
The way this ejection system works in a # 4 Lee-Enfield, is made possible by custom building the Lee-Enfield raceway to be use with the .500 inch rim diameter .303 british cartridge, and so far, the only other cartridge that will function flawleslly along the Lee-Enfield raceway is the rimmed magnum cartridge of the same rim diameter as the .303 british cartridge.
Empty cartridge like from the 45-70, will work along the Lee-Enfield raceway, but will not eject until the reach the ejector screw.
Empty 303 british cartridges, that fails to be ejected by a weak ejector spring when they reach the stripper clip thumphole cutout, will when they reach the ejector screw, in most cases, just flip 180 degree's and land on top of the next round, and thus jam the gun, if not remove by hand.
Live 303 british rounds, due to their longer lenght with a bullet, will not be ejected by the ejector spring when they reach the charger clip cutout along the raceway, because the bullet is still inside the chamber when the rim of the cartridge reaches this cutout, and first when the whole cartridge is out, will it finally touch the ejector screw, which then do the intended job
