10 gauge round ball loads.

[BigMrTong]

Brilliant ! thanks, ill search myself out a copy.

It's from "The Gun and It's Development" by W.W. Greener, an 800 page volume. It's ninth edition was published in 1910. It starts with the longbow and works it's way up to firearms of the late 1800s. I got my copy from the NRA, re-published in 1995 as part of their firearms classics library.

[Ballistics in Scotland]

I'm afraid one of the best technical works I know on shotgun and ball gun technology, General Journée's "Tir des fusils de chasse" has never been translated, reprinted in French or even so far as I know properly digitised. So copies sell for high prices in France. There are too many tables and mathematical symbols, and the author was badly served by his publishers. It is too badly printed to photocopy to publishing standards, and mine is printed on miserably brittle paper.

https://www.earmi.it/download/libri/Journee.pdf

It has been an important source for writers of modern or nearly modern times, which isn't bad for someone who served in the Franco-Prussian war of 1870.