Nice groups! My Ultra 223 is just coming around I think. When I got it a year ago, I went thru a half dozen varieties of factory loads, Black Hills, UltraMax, White box, etc, and none of them shot for beans. I eventually worked up my own, 27 gr. of Varget pushing a 40 gr. Nosler BT and got under 3/4 inch. I've been using that load on nutria all winter with invariably fatal results. A few weeks ago, I was going to the range and I decided to burn up all of the non-shooting varieties I had to salvage the brass. Got a 2.9 inch group at 200 yards with the 52 gr HP UltraMax. Since I have no clue what the powder was in that load, I guess it's back to the drawing board.
Dang, I hate hobbies where the failures are so much fun....