Thanks guys, interesting explanations as to why the "step" is there. The greater the step i would guess the bigger the discepancy in actual to marked choke performance?
Sounds like some "jugging" is occuring with the design of these chokes, which is why the maths doesn't add up.
I would normally shoot UK 1/4 and 1/2 (US imp cyl and mod) on sporting clays, but from reading this would UK imp cyl and 3/8 (US skt and light mod) chokes equate more to this?
And for skeet, cylinder and cylinder seems the way to go?
Appreciating all you input.
