How is the chamber lead angle determined?

[craneman]

Kurt,
The #4 is 1.12" @ breech, 1.08" @ muzzle.
#5 is 1.16 @ breech, 1.12 @ muzzle.
This is for a Green Mountain Winchester taper.
Wish you were a little closer,(for lots of reasons) I would take that tower down for you!

I know the topic has been beaten to death on many forums over the years, BUT do YOU feel that there are advantages to one barrel profile over another?
ie; round, 1/2 round, octagon?
My rifles to date have all been 1/2 round so I don't have any personal experience to draw from.

Thanks!

Todd