There is alot to consider when working off charts . There are so many variables , I don't use a chronograph . When I find a load that shoots consistently tight groups at 100 yards in perfect condition I use that load from 1 to 2 hunderd yards , wind and temperature we can't control and human error is the only thing left . The rifle and round can only do so much , reading the wind is a talent . I keep it simple try not to over think , easy to blame the wind.
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