Yesterday I took my new Ruger Stainless Laminate 77/17 out along with a couple of 22 centerfires. At 100 yards I got 1/2 to 3/4 inch from my centerfires and 2 1/2 to 3 1/2 from my 77/17. I used both Hornady and CCI. Both grouped poorly. I am leaving for a prarie rat hunt on Wed. Please Help!!!