hello, thank you. Those are Magpul 10 rd magazines, in an AR15. Not single fed. Please note most everything is shot at 50 yards, unless it says otherwise, like the AA2230 page. Basically, I do this from my Marine Corps Rifle training. "Aim small, hit small". So when I am using a 25x mag scope (Vortex PST II) at 50 yards, I can aim and fire at a spot, very very small. This improves consistency and also improves my trigger skills, as staring at such a large spot so clearly allows me to get feedback from trigger break, to make sure I am not even slightly "pulling" a shot. For Valkyrie, I am using a Trijicon 50x mag scope at 50 yards generally, and I am aiming at an even smaller spot.
The go to powder to shoot 55 grain bullets in AR15 5.56 is probably H335 and AR Comp, to name 2 good ones. Pretty lights out.
Alliant AR Comp review
www.natoreloading.com
Of note, that WOA Predator barrel is not a Krieger, or higher end blank, its just the standard WOA offering, I believe they sell the barrels alone for around $~300 ish. Compass Lake and WOA offer competitive barrels at good prices for their "normal" non upgraded offerings. Both are good companies.
I never paid for the upgraded blanks because I figured if I am getting results this good with their "normal" how much better is the high end blank for near double cost? Diminishing returns...its probably better though....We will find out soon, I have a Krieger Valkyrie coming...