Daryl,

Thank you for pointing that out, I think I have it right, but am unsure and did not write the diameter down. I will borrow measuring tools and get you the diameter of the smooth portion of the choke on my Evans, which is the Webley & Scott late version of the paradox choke. Regardless of the diameter, there is a rather massive smooth choke that begins approximately 4" from the muzzle. The rifled portion starts 2" from the from the muzzle. I am attaching a section of text from Handloader #227 by Ross Seyfried concerning the dynamics of the Fosbery slug traveling down a Paradox barrel.

"A big, 700+ grain bullet goes
screaming down a barrel with a bit
of slack. It then encounters a forcing
cone, some 25 inches later,
when it is going over 1,000 fps.
In the space of about 3 inches, in a
sniff of a second, this bullet goes
from zero to a one-turn-in-36-inch
spin and is hammered down from
.736 to .690 inch – and goes right to
the target."

I want to cerosafe cast the choke on my barrel but am somewhat afraid I will never get the casting out...