Idea behind it is you make a point form die with say a 6S nose (like a 15X SMK)
And any 308 pill you drop into it will come out the same weight as started but 311 diameter and with a 6S nose
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Sweet, if you have 308 size lead wire ready, that sounds like a quick way to do it...
Like these ? Corbin Custom Point Forming Dies
Either make them from scratch like you suggest, or drop a 30 cal 155 SMK in final die and you get a 311 cal 155 SMK (effectively)
Sorry guys ,just realised Tertle is on this website anyhow.hes an absolute goldmine for .303's, ammo etc sure he'd put you on the right track.