NH K9, that would be a great test and will tell you A LOT about the gun. After I have the load worked up for a gun I used to do something very similar to track cold bore POI. However since shooting 3 x 5 round groups on the same target and/or 10 round groups I have found that I get no surprises. What it will do is show POI shifts due to bedding/mounts/scope/etc. That happens more than people think.
