Ran an OCW on my AAC-SD-dropped-on-an-HS-Precision-stock-donated-by-a-Hide-member build.
Shooting from a Harris knock-off bipod and a rear bag with a Sightron SIII 3.5-10x44 scope, I shot 3 each starting at 41.5 gr I4895 up to 45.4 gr behind an SMK 168 @ 2.88" COL with CCI 200 primers, in Federal brass that's been fired twice and neck sized with a Lee collet die after each firing.
I also whipped up a similar set of cartridges for my buddy and his 700 VTR in .308, only difference being those cases were PPU once fired then FL resized (I was gonna use them in my gas gun) and I'm hoping that didn't skew his results too bad.
Anyway, we setup yesterday at 100 yards (60 degrees, almost no wind) and ran through the test.
My first shot was 3/8" below dead center, his was outside the 1.5" diameter ring. Quite a bit outside.
I moved to the next charge (41.8 gr) and the same thing happened, only mine was near dead center, his, not so much. Hmmmmmmm.
It took until the 2nd pass at 43 gr before any of my shots even left the ring. I was pretty surprised; I would only consider myself an average shooter at best.
Every shot elicited a little chuckle from me... it was shaping up real good, but I was pretty sure it was going to fall apart. Can't get good data if I'm pulling shots left and right, ya know?
Wen it was done, I think I can identify 3 nodes (bottom, middle, and top) and the areas in between with clear trends, groups opening up and POI shift.
14 3 shot groups with a worst of exactly 1 MOA and a best of .18 MOA( right where I stopped, at 45.5 gr), nearly half below .5 MOA (6 of 14) and an average of .605 MOA across all 14 groups.
My buddy's 700 (27" triangular barrel with 5R 11.25" rifling in a B&C tactical stock) mostly threw shots all over the place, with definite POI shifts/groups opening up at different charges, it all came together once at 43 grains with a dime sized group then opened up immediately .3 gr later.
My goal for the AAC-SD is target and banging steel to 600, so I guess I will investigate that node at 43.9 in my rifle.
Joe
Shooting from a Harris knock-off bipod and a rear bag with a Sightron SIII 3.5-10x44 scope, I shot 3 each starting at 41.5 gr I4895 up to 45.4 gr behind an SMK 168 @ 2.88" COL with CCI 200 primers, in Federal brass that's been fired twice and neck sized with a Lee collet die after each firing.
I also whipped up a similar set of cartridges for my buddy and his 700 VTR in .308, only difference being those cases were PPU once fired then FL resized (I was gonna use them in my gas gun) and I'm hoping that didn't skew his results too bad.
Anyway, we setup yesterday at 100 yards (60 degrees, almost no wind) and ran through the test.
My first shot was 3/8" below dead center, his was outside the 1.5" diameter ring. Quite a bit outside.
I moved to the next charge (41.8 gr) and the same thing happened, only mine was near dead center, his, not so much. Hmmmmmmm.
It took until the 2nd pass at 43 gr before any of my shots even left the ring. I was pretty surprised; I would only consider myself an average shooter at best.
Every shot elicited a little chuckle from me... it was shaping up real good, but I was pretty sure it was going to fall apart. Can't get good data if I'm pulling shots left and right, ya know?
Wen it was done, I think I can identify 3 nodes (bottom, middle, and top) and the areas in between with clear trends, groups opening up and POI shift.
14 3 shot groups with a worst of exactly 1 MOA and a best of .18 MOA( right where I stopped, at 45.5 gr), nearly half below .5 MOA (6 of 14) and an average of .605 MOA across all 14 groups.
My buddy's 700 (27" triangular barrel with 5R 11.25" rifling in a B&C tactical stock) mostly threw shots all over the place, with definite POI shifts/groups opening up at different charges, it all came together once at 43 grains with a dime sized group then opened up immediately .3 gr later.
My goal for the AAC-SD is target and banging steel to 600, so I guess I will investigate that node at 43.9 in my rifle.
Joe
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