I really am not a constriction fanatic one way or the other but at least one tube has constriction. I will gladly measure the tubes. But I had rather pattern the tubes with a couple shot sizes. I think I have loaded cartridges in #6s, #7s & #8s and I can always pull some #9 shot from somewhere.

[Linked Image from thumbs2.imgbox.com]

Left tube measures around 14.3-14.35mm.


Hochachtungsvoll,

Raimey
rse