I have the SPS tactical and it shoots .5 MOA all day long. I do not clean the copper fouling out after I shoot. I wait until it starts interfering with the accuracy. I was taught this by a long range shooting instructor (Todd Hodnett). If I clean the copper out after every day of shooting it loses accuracy and is a .75-1.25 MOA rifle. I still have a few rifles I clean rigorously after shooting, but not my SPS.
" The strongest reason for the people to retain the right to
keep and bear arms is, as a last resort, to protect
themselves against tyranny in Government...." - Thomas Jefferson