Here's Hallowell's chart
http://www.hallowellco.com/shot_size_chart.htm"Eley Shooter's Diary", 2005, gives different numbers:
4 3.1mm, .12", 170/oz
5 2.8mm, .11", 220/oz
6 2.6mm, .10", 270/oz
Yet another chart
US.....UK........Italian
mm...inches.mminchesmminches
4..3.3.0.13..2.8.0.113.1..0.122
5..3.0.0.12..2.67...0.105.2.9..0.1142
6..2.8.0.11..2.54...0.102.7..0.1063
7..2.54..0.10..2.4.0.095..2.5..0.0984
8..2.3.0.09..2.29...0.092.3..0.0906
I still think y'all are just messing with us
but it did take us Colonials awhile to get it together too
And BTW the SAAMI standards are fairly relaxed
1) Pellet size variations allow for +/- one pellet size (+/- .010" dia.) of variation in game loads.
A No. 6 (.110") game load could contain pellets ranging in size from No. 5 (.120") down to No. 7 (.100").
On target loads it allows for +/- pellet size (+/- .005" dia.) of variation; a No. 8 (.090") target load could contain pellets ranging in size from No. 7 1/2 (.095") down to No. 8 1/2 (.085").
2) Load weight variations can range from +4% to -7% in game loads and +3% to -5% in target loads; about +/- 1/8 oz. of variation allowed per shell.
3) Pellet counts per ounce can vary by +/- 10% for both game and target loads.
