Re: Horizantal spread
Very few anemometers will read down to 1-2 mph reliably, but it must have been absolute calm, I'm assuming. Usually you can't even feel much of anything at these speeds. With this calm of condition, and only six shots fired, I'd say you need to do some more shooting before calling this a legitimate "horizontal spread" rather than just a fluke. Most shooters don't expend anywhere near enough ammo for their groups to be statisically valid, so it really is just an educated guess. Load up some more of the same and repeat the strings at least five times. The horizontal componenet may or may not show up with the increased groups, and that should tell you a bit more.