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Hi you have done the right thing with the recoil lug , my guess is it's mainly down to the barrel not being fully clear of the stock , have to test to see if the barrel is floated when it's hot , 2 shots are on the money then the 3 the barrel has got too hot expanded and is touching the barrel at the well documented pinch point at the front of the stock ,
Wait for the lug get it put in take it shooting and then check the clearance
