Just wish to say a large 'thank you' for sharing your findings w/us.
It makes for some very interesting thoughts, particularly when one reads 'Experts on Shooting' [close to the correct title anyway, I'm not home at present]; in it there is ref to the trials held in England for both patterns and penetration through some then standard cards and it is evident that the jug choking you found was lost to the players in those games between the various Brit makers. One can surmise that the best patterning bbls. had through some fluke of internal finish a bit of choke resulting in the term 'improved cylinder', at least that has been my interpretation.
Once again, a big 'Thanks!' for the insight and the ref.
