Well lads problem solved..
prone on the ground to get the spikes in the dirt and a better rear rest, and we have 5 shots into about .7 moa
A bit humbling but good to be sorted..
Lessons learnt are that you can get away with poor rests and technique in lighter recoiling rifles (groups were fine with the same technique in my 22 creed and 6.5 prc) but not in a big magnum.
And to always check the shooter first before tinkering with a load!
Appreciate the input gents
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