Nice speeds and accuracy. That velocity/pressure should drop when temps fall during hunting season. I would be very happy with that load and would not go up any at all for sure.
Is that new brass? Did you shoot more than 1 group with the load that gave you 1.2 ? You might squeak a tad more accuracy with partial sized brass, but I would double and triple check for feeding if you do, for hunting. I would say anything MOA or under is good in your set up, and anything under is a bonus. I had a Hart 338/06 that shot 1/2" all day.........but what is really key is that your rifle is consistent, on your first cold bore shot for hunting, IMHO.
Did you float the barrel or do anything to your rifle, or is it all OEM? I'd suspect floated would give you the most consistent first shot POI and likely groups as well.
Congrats on finding an accurate load with great speeds.
