Originally Posted by sjtrent I use this chrono to develop 10mm loads. For semiautomatic pistols you need one with a picitinney rail. Magnetospeed sells a picitinney rail attachment for 25 bucks. It does not come with the chrono kit. Sent from my SM-G950U using Tapatalk 10 4 thank you Sent from my SM-G965U1 using Tapatalk
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Originally Posted by sjtrent
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