brdavis
Sakos are great rifles. Usually very well made and normally quite accurate.. There is nor inherent problems with their mount system that I'm aware of. Any time a rifle suddenly stops shooting well I suspect the most common things first.. Loose screws (action, scope ring, scope ring clamp) or a scope that's gone south.. There are things that you can do to a rifle by cleaning it that could cause sudden accuracy loss. Cleaning fron the muzzle or causing any damage to the crown of the barrel is an easy one to do. Firing the rifle with any solvent or grease or oil in the bore is a fatal problem(hydraulics causes loose spots in the bore). Check all screws for tightness and visually check the crown.. The other thing is improper disassembly or rather re-assembly. Assembling the rifle with the magazine touching the receiver when the screws are tightened can put the action in a bind and cause problems. A description of the groups shape would help, is it round(just too large), to groups(usually found if the action is torqued), verticle dispersion, horizontal??? Check the screws and if nothing is found a bit more info please... Oh I almost forget,, you were using the same ammo, right??