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Tried new stuff today. As my volocitys go down, my groups get wider. I was shooting smk 190 gr hpbt. First with 16 gr AA 1680 and shot 1/2 in groups. Then 14 gr, with 3/4 in groups. Then 12 gr with 1 1/2 in groups. My chrono didn't work, but all were supersonic. I'm going to try 10 gr tomorrow. The gunsmith who built this for me said it is a 1in8 twist.
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