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22 creedmoor help

I've run 88 ELD-Ms at 3150fps in a 1:8" and they do well at my elevation. My drop seems to be "on" for the published G7 BC to 1200yds even though the Berger twist/stability calculator says I'm only at 1.2 on their scale. I have not blown any of them up yet, and I'm 600 rounds in so far. I have a 4-groove 1:7" krieger that blows lots of things up as low as 3050fps.
What is your elevation?
I am 800feet above sea level and wanting to try the 88’s in my 8twist
 
The dense-est atmospheric conditions's I've actually shot in was 17˚F at 6500' elevation.
Drop was *right* on at 600 yards and also at 1200yds in better (warmer) conditions. 800' might not work, but it's easy enough to test, isn't it? I'd try on a hot day... well, "hot" for the UK.
 

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