Ruger 5.56 Scout Rifle 16.1" 1:8t
55gr Hornady SP w/c
Nosler brass
21.90grs D8208BR
CCI 400 standard primer = 2765 fps
CCI 450 magnum primer = 2712 fps
Tikka T3x CTR 20" 1:8t
55gr Speer SP
Nosler brass
21.90grs D8208BR
CCI 400 standard primer = 2960 fps
CCI 450 magnum primer = 2958 fps
The magnum primer improved standard deviation by 45%