This website may help http://www.eskimo.com/~jbm/calculations/traj/traj.html
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1-7 barrel tw = -6
1/10
1 in 14
Simple, it it is a true barrel simple find the measurement from inside to inside of your barrel and divide by 2. IF it is not a perfect half circl barrel or true barrel, simple find your chord (measurement inside to inside) and find your rise. Once you have these measurements you can use your diameter formula to figure the radius
Optimum.