I had good promise with 23 and the 147 Hornady, but just haven't had the time to work with it more. I had a great load with 46.7 rl22 so figured 23 would work. I couldn't fit that much powder in the case, as I guess 23 has more volume. I tried 46.0 and got around 2770 fps if I remember correctly. I had only loaded 3 up, but it put 2 within an inch or so at 500 yards and the third was about 4" away. No visible pressure, and the temperature was in the 90's. I'll try it again this spring when I have more time.