Norseman,
This is sounding a lot like the trouble I had with my 243, without the forend on is there any movement or rattle in the gun. I can't remember if you had used feeler gauge to check how tight your lock up was. If I remember correctly you should be able to close on but not pull out a .002" feeler, maybe .003" but that would be outside.
I used plasti-gauge and measured a .006" gap. it took a strip of .0045 feeler gauge in the hinge slot to take up the slack. I go the groups down to 1.25-1.5 (not bad for what I was getting and the heavy trigger) , But I sold it off to finance another gun.