I have a Nikon Buckmark 4x14 on a Mini 14 that I suspect is wandering. I have replaced the factory barrel with a heavy Krieger and it has always shot nice small groups, now they have opened up in a distinct stringing pattern. I can change scopes to test this rifle, but I was wondering what others shooters had experienced with semi auto rifles. I have a box full of scopes with broken cross hairs and tilted reticles from spring piston air rifles, but was hoping others could tell me what to expect from semi autos.