Thanks to everyone who gave advice and all the good offers.
Was the bedding/recoil lug that gave me the dramas.
Tried the same loads again today and they punched though the same group as last week, tried some 200y shots and were bang on.
Looking back at results etc it all makes sense to me but never really considered it to be the bedding as it was bedded by a gunsmith...
However on the plus side After all this have learnt a fair bit about reloading and shooting the rifle.
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