I guess nobody is going to jump in and explain this to Wonko. Us Brits have so many old Imperial measurements it makes The Ancient greeks look like pre-school mathematicians! When they all migrated to The Americas, they obviously forgot all the variations of weights and measures, along with the ability to spell aluminium and centre correctly!!! (Among others!). :biggrin: As for U.S. Gallons? What's that all about then?? :fie:
The way Barry Simpson gave the choke measurements to Liz were based on the old (read ancient) measurements of deiation from the measured bore size (whatever that may be). Personally I find this to be a perfectly acceptable and understandable way to equate choke and expected patterns thrown. (Unless you want to be fussy and split hairs for a living!).
Based on 40 thousands of an inch constriction being equivalent to full choke, 20 thou equals half choke etc. etc.
Liz's Baikal therefore, has between improved cylinder and quarter in one barrel (the 7/40th's), and half way between quarter and half in the other (the 15/40th's) making it very suitable for skeet in my humble opinion. Certainly not one for the Fast Trap Disciplines.
One day someone will get me to understand more modern methods of expressing choke constriction, but until then I'm strictly Imperial where Cylinder, Improved Cylinder, Quarter, Half, Three Quarters and Full are all you need to know, and anything inbetween is near enough to make no difference. :biggrin: