In complete agreement with Ed. The Prvi Partizan brass is currently the best and most available brass for .303. The Oring method eliminates all headspace problems. Make sure the case web support is with in a safe range if your correcting a long gap. If you have more than one LE then purchase a set of colored Sharpie markers and color code your fire formed reloads for each rifle by ringing the primer pocket with the marker. Once I Oring fire form a case for an LE I neck size the case only from that point forward. The 303 case in the EL have the luxury of being double secure. If you reload you can use the rim to set your head space, the case shoulder, or both. Leave it to the Britishicon to wear both a belt and suspenders.