Replaced with an AI ATX grab yourself a bargain.
https://www.guntrader.uk/guns/rifles/accuracy-international/bolt-action/6-5x47-lapua/ae-240310154519772
I have found that the rifle needs to be spotlessly cleaned and even then takes a little time to adjust to copper from lead.
A bit like if you ever clean a .22rf it takes some time for the barrel to settle down.
Hope this helps and seen this happen on two rifles now so don’t think it’s just me.