Barrel contour

I have been discussing barrel dimensions with my gunsmith, and settled on measurements as this:
A: 1.22"
B: 2.00"
C: 1.06"
D: 0.70"
E: 24.0"

The drawing shows a straight taper between point C and D, but we will probably end up with a little more taper in the first half, and straightening it a bit towards the muzzle.
I have allways liked a small edge or step "highlighting" the transition from chamber area to tapered barrel.

Any comments?