I agree with .243win. If you're getting 3 inch groups at 100yrds there's something wrong. My M77 in .270win will put bullets on top of each other at that range, and Rugers aren't exactly known for their stellar accuracy.
I should note that I am anal about keeping the bore clean, I follow barrel break-in procedures. And my rifle does not need any "fouling shots" for it to shoot at it's best.