TFB Writers MOA All Day Challenge- Rusty S.

    You did say "All day", Right?

    For this challenge, I used two firearms.  In anticipation of pronghorn season, I brought out my 6.5 Grendel AR. For the other firearm, when Pete first brought up the challenge with the title “MOA All Day”, I immediately thought of a belt-fed with a quick change barrel, as they can shoot “All Day” a bit better than other firearms.

    Firearm 1:

    My Setup:

    • Ohio Ordnance Works M240SLR
    • Standard M240 Bipod
    • Elcan Specter DR DFOV14-C2 set on 1x power as specified for 50yards per the challenge
    • Black Hills 168gr BTHP

    Photos:

    Firearm

    Firearm

    Optic set to 1x as required

    Optic set to 1x as required

    Target (Holes at top center are from ranging shots to adjust for impact difference for 50yards vs zero distance)

    Target (Holes at top center are from ranging shots to adjust for impact difference for 50yards vs zero distance)

    P7122416

    Target w/calipers on tighest group

    Target w/calipers on tightest group

    Raw Data:

    .948, .955, 1.212, 1.232, 1.365

    Subtracting bullet diameter of .308 to get center-center:

    .64, .647, .904, .924, 1.057

    Average:

    .834

    MOA at 50 Yards (in inches:

    .5235

    MOA:

    .834/.5235= 1.59 MOA average

     

    Firearm 2:

    My Setup:

    • Les Baer Custom 16″ 6.5 Grendel upper receiver
    • POF-USA P-415 lower
    • Timney Trigger
    • Magpul Furniture
    • Grip Pod (1st gen)
    • Swarovski Z6 1.7-10×42
    • Alexander Arms 123gr Lapua Scenar BTHP

    Photos:

    Target confirmed at 100 yards using rangefinder

    Target confirmed at 100 yards using rangefinder

    Shot target still on frame frame

    Shot target still on frame frame

    Smallest group

    Smallest group

    Excuse the scribbles, my micrometer was not zeroing out correctly, giving smaller values than it should. Changing the batteries fixed the problem.

    Excuse the scribbles, my micrometer was not zeroing out correctly, giving smaller values than it should. Changing the batteries fixed the problem.

    Raw Data:

    .60, .696, .833, .995, 1.15

    Subtracting bullet diameter of .264 to get center-center:

    .344, .44, .577, .739, .894

    Average:

    .5988″

    MOA at 100 yards (in inches):

    1.047″

    MOA:

    .5988/1.047= .572 MOA average

    Observations:

    There’s always room for improvement, and the fundamentals of shooting cannot be ignored.  Shooting the 240 for groups was hilariously fun, despite the not-so-match trigger and the rather long lock time.  The CX5936 Reticle is pretty thick and I did not have it mounted up in an M192 Tripod, so I had to be careful. I did really enjoy shooting the challenge with a firearm that can shoot MOA literally all day, given enough ammo and another barrel.  As far as the 6.5 Grendel AR goes, I could improve, but I was pretty happy with the results.  Where I got myself into trouble and larger groups was in getting impatient with the wind and rushing a few shots.  This was a very fun challenge, I look forward to doing it again in the future with some different firearms.  Thanks, Pete!

    Rusty S.

    Having always had a passion for firearms, Rusty S. has had experience in gunsmithing, firearms retail, hunting, competitive shooting, range construction, as an IDPA certified range safety officer and a certified instructor. He has received military, law enforcement, and private training in the use of firearms. He is fortunate enough to have access to class 3 weaponry as well.


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