I'm also finding N133 to work well for me. 20" Aero upper, accuracy was showing up with once fired Hornady Brass bumped .003", 27.7gr N133, cci 450, col-2.286, velocity- 2640 fps @ 12' and 62*.
Loads were safe and just starting to show slight primer flattening but, edges still completely round.
Initial groups 3-shot groups were in the mid 3's with 4 shot groups in the 4's. (100 yds)
I have another test, loaded up to start 5 and 10 shot groups. Haven't yet started with seating depth adjustments. This load was safe in my gun so, Start your loads low and work up from there as your MMV...
Loads were safe and just starting to show slight primer flattening but, edges still completely round.
Initial groups 3-shot groups were in the mid 3's with 4 shot groups in the 4's. (100 yds)
I have another test, loaded up to start 5 and 10 shot groups. Haven't yet started with seating depth adjustments. This load was safe in my gun so, Start your loads low and work up from there as your MMV...