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Ah, ok - I'm not good with numbers. With 1:7 or 1:4, does that mean I would need to put either 4.0 inches or 7.0 inches in the Strelock field (Twist rate, inches per turn)? Also, in order to work out my own BC like you have, I assume I would need to first purchase one of those chronometers...

I have an FX Wildcat 30ftlbs and I can't seem to line up Strelock with the POI I am getting. I am pretty sure all of the data is correct in the app, except possibly the twist rate which is set at 12inches by default. I don't know what the twist rate is for a smooth twist barrel? What do others...