Gents,
My computer is acting up and I've had to re-post this, so you only get a picture of my G.A. Precision AR-10. The rest went by-by...
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The trip to the range was great. Weather was 52 degrees, overcast, and not raining. That's a good day for Western Oregon this time of year.
The session began by chonographing two loads that have shot well in the past. The first was developed for my M25 over a decade ago and the second is the load I use in my M40A1.
The GAP rifle has a 20" tube and standard flash hider. Velocities were good, proving you don't give up all that much going to a 20" barrel over the 26" on my bolt guns.
Load #1:
7.62 X 51MM 4/1
LC 81 NM brass(once fired)
Sierra Match King 175 Gr.
42.5 Gr./AA-2520(old Isreali produced stuff)
Primer: Winch Large Rifle
OAL: 2.800"
Average Velocity: 2,546 FPS
Notes: Very consistent load with low SD
Load #2:
7.62 X 51MM
Lapua Brass(new)
Sierra Match King 175 Gr.
44.0 Gr./Varget
Primer: Federal 210 Match
OAL: 2.800"
Average Velocity: 2,639 FPS
Notes: Extremely accurate in M40A1
OK, now for the shooting.
Initial groups were disappointing to say the least. 1.5 to 2.0 inches! Then I discovered my bi-pod had come loose(another reason I don't like them). Tightened it up and stored it. Shot off the bags for the remainder of the session. Groups tightened immediately with most hovering just around 1". Still disapointing.
I ended the session with my pet bolt gun load(#2 above) and manage a nice 3/4" group with most going in one hole. As I stored the rifle in it's case I discovered my lower rail guard was loose undoubtedly attributing to some of the vertical stringing.
All in all not a bad first showing, but proves several things. Check you're equipment more carefully, Howe!
The rifle is capable of sub-1/2 MOA accuracy, but I'm not at this point. Once I get some more trigger time and sort out a few things I"m sure things will improve. Not a bad first trip.
The scope is OK, but I've got to get the Kill-Flash off of it. It's like looking through murk with it on. Definetely cuts down on the light gathering capabilities of the scope. I may mount a Luppie MK IV on it for further testing.
Have pics of the 3/4" group, but lost them in the first try. Computer goes in the shop tomorrow and I go back to the drawing board on a few issues.
Semper Fi,
Wes
