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360 (the no. of degrees in a circle) divided by 5 = 72
Then divide 72 by 2 =36
The angle needs to be 36 degrees on each side .
But it`s easier to just look at the bullet to see if it`s scored or rubbed by the bore not the rifling (or lands).
Now that ya have this info the big ?? is does the throats match the bore ????
To answer ya question I have taken a ribbon of pop can & wrapped the bullet to make it round then subtract the thickness of the can .
Don`t forget to subtract twice the thickness though .
Where ya getting leading at ????
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GP100man 
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