delete

[justinfraser69]

delete

 

[Anfoman76]

Is the barrel free floating? It sounds like that could be your problem, two shots warm up the barrel then there's a barrel shift hence your shift in impact. That would be the first thing I checked

 

[wilsy]

Ammo

As yo said you have omly tried two sorts of ammo.
I have one in .308 and it shoots damn well.