That's pretty fine shooting for a Mini14. My last Mini had the worst vertical stringing you have ever seen. A 20 shot group at 100 yards would be 1.5" wide and 10" tall. I gave up and got an AR-15.
Not your average Mini...
These folks do a good job. I got my work done some years ago before prices went this high.
http://www.mini14ranch.com/Mine has the three point bedding, a trigger job and muzzle brake.