What really perplexes me about these choke threads is the mixing of constriction & choke, and tying neither to shotsize. For the most part, choke is 1/4, 1/2, 3/4 etc. Constriction is narrowing of a couple couple thou deviating from some nominal inside diameter. It really has nothing to do with choke unless you tie it to a shotsize and/or load. If we are going to talk about choke, let's see some percentages of specific number of shot in a 30 inch circle at some distance. It is as simple as that. Now if someone on an off chance has a tube with constriction that results in the same percent choke for #2s, #4/5 & 7 1/2s, I'd like to see it.

Another sidebar is even though the pattern may look lovely in 2D, it doesn't necessarily mean that all arrive at the same time.

Kind Regards,

Raimey
rse