I've always preferred thinking in terms of the numerical constriction, rather than an arbitrary name whose specific definition is not always the same everywhere.
My friends and I do that too, James. When we shoot sporting clays together and someone asks one of them "what they shot on that bird", they will answer a "5", or a "10", etc.
"Course, I joke with them a lot because I shoot two fixed "20s" in my MX 8. Sometimes we will look at a bird, or a pair, that will be really close and I will mumble "Hope I've got enough choke for that". Other times they will discuss a presentation and one will say "A "0" will kill that". I will reply "Maybe, but I'm sure a "20" will.
SRH
