doublegunshop.com - home Forums General Discussion DoubleGun BBS @ doublegunshop.com Choke percentages at different ranges

Thank you for posting that link. Here are the charts, which are a bit easier to interpret





I don't have Oberfell & Thompson, but it appears that the data is calculated using mathematical formula rather than having been measured, as is likely the shot spread data I posted.

Compton's study (linked above) discusses 3 dimensional representations of shot cloud phenomena starting on p. 155; and his conclusion:
"It has emerged clearly from this work that it is not possible to produce a satisfactory theory which can predict the downrange behaviour of shot clouds from the muzzle condition in sufficient detail to render practical measurement superfluous. Ballistics therefore have to remain very much an experimental science. Also further work is required to understand the full effects of choke constriction and choke profile on shot clouds."

Oh well - still fun to talk about