Originally Posted By: JDW
So how much does length of choke matter.


It doesn't. See "Sporting Shotgun Performance," by Dr. A. C. Jones, page 58, Figure 41. Neither does a parallel section.

Shot is at least a semi-fluid and subject (pretty much) to the laws governing fluid dynamics. Shot flooooows through the forcing cone and the choke. It does not smash into these constrictions. Rather, it flows through in an orderly fashion. Deformation occurs at ignition and early acceleration.

DDA