Bad Moon Rising.....
Shooting at 300 today..used a bipod on the bench with rear bag..
223 /77 gr MK..Varget powder..23 grains is all..black hills brass
2nd loading..FL sized..Anyway put 10 rounds into to 10 ring
then 5 where 2 to 3 inch low..What the hell causes this..
Bad Moon Rising.....
Perpetual Optimism is a force Multiplier....
Excellent reloading and shooting skills, that's what causes it.
A vertical dispersion of three inches with two thirds of the rounds in the 10 ring would make any 1000 yd shooter jump for joy. That's better than .300 MOA and at 1000 yards that's fantastic, especially from a bipod.
You were shooting at 1000 yards, weren't you?
My guess is you changed you position some how. If loading the bipod you may have changed the amount of pressure you were applying. Maybe started to get too confident and not focusing on the reticle. Shift in your natural point of aim. Any of these things could change your POI. If group was relatively the same size, you changed something on your end.
Cheek & shoulder pressure and placement can cause this.
Reloading can cause this too. Just because a loads shoots good at 100 doesn't mean it will shoot good farther out till you test at those distances.
good replies..when it warms up a little I am going to try this same load again..
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