I shot the lower target today in our Club’s 100 yard reduced course match. I was using AA4064, a short cut version of IMR 4064.
While I get excellent groups with the stuff in the .223, it is only in my 24” Krieger barrel that I get the velocities I want. Krieger barrels are very tight. I can only get 24.0 grains of AA4064 in a .223 case and in my Rock River NM AR15, the velocities were just not what I wanted.
CLE Space Gun 1:8 Krieger barrel.
69 Sierra 23.5 grains AA4064 lot 5902 Fed cases WSR (Brass) OAL 2.25
5-Aug-05 T = 100° F
Ave Vel = 2855
Std Dev =31
ES = 83
Low = 2817
High = 2900
N = 10
Rock River Arms NM LAR-15 20" 1:8 Stainless Wilson barrel
69 Sierra 24.0 grains AA4064 lot 5902 "T223" cases WSR (Nickle) OAL 2.25
22-Aug-04 T = 75° F
Ave Vel = 2768
Std Dev = 21
ES = 58
Low = 2741
High = 2799
N = 15
While I get excellent groups with the stuff in the .223, it is only in my 24” Krieger barrel that I get the velocities I want. Krieger barrels are very tight. I can only get 24.0 grains of AA4064 in a .223 case and in my Rock River NM AR15, the velocities were just not what I wanted.
CLE Space Gun 1:8 Krieger barrel.
69 Sierra 23.5 grains AA4064 lot 5902 Fed cases WSR (Brass) OAL 2.25
5-Aug-05 T = 100° F
Ave Vel = 2855
Std Dev =31
ES = 83
Low = 2817
High = 2900
N = 10
Rock River Arms NM LAR-15 20" 1:8 Stainless Wilson barrel
69 Sierra 24.0 grains AA4064 lot 5902 "T223" cases WSR (Nickle) OAL 2.25
22-Aug-04 T = 75° F
Ave Vel = 2768
Std Dev = 21
ES = 58
Low = 2741
High = 2799
N = 15