Today I was checking the zero on the new scope for my L461 carbine and ran into in issue I've seen many times before, especially (but not exclusively) with Mannlicher-style rifles and carbines. In a string of 5 or 10 shots, the hits will group themselves into two distinct clusters an inch or more apart. Two touching in one group, then two or three together in another, then back to the first group for a couple of rounds, etc. Now I am fully aware that this could be some kind of odd shooter error, but it seems strange that I get two distinct clusters in a string of shots, with hits going back and forth between the two. Have any of you run into such a phenomenon, and do you have any idea what might cause it. And yes, the action screws are tight. I plan to do more testing with varying the tension on the barrel band screw, since I have seen in usually reliable sources that this can have a significant effect on accuracy. Any relevant thoughts or experience?