Hi Ian,
sounding better towards it being inert,there is a thread on here somewhere about a month of manufacture that none of us have not found yet,may be worth doing a post search on this.
But PLEASE do not allow your local contact 'pull' this round unless they have the correct equipment to do so,I have seen so many nice/scarce rounds ruined by plier marks and cracked necks ect.
I would highly recomend TonyE's offer to look at this for you,he knows what he is doing,has the equipment to do it properly and he is a nice guy,sound as a pound!(and you could get to see his amazing collection).
Any chance of a photo of your round(we all love photo's)
All the best
Tony
P.S the month issue is on this thread, Doh!