So, sent another 2000 or so rounds downrange. I noticed that the Mk262 hits a few inches low, so even if I had the choice between the Mk262 and the Mk318, I'd go for the Mk318.
The Mk318 hits dead-on at 100, 200, 300, 400, and 500 meters. At the 6 mark on the scope it lands directly on target...