I was half right.

"Successful Shotgunning" by Peter F. Blakeley, page 142

No mention of pissing down the barrel but he does talk about a badly pitted barrel with numerous poorly removed dents owned by a gentlemen named Will, known as a crack shot. Blakely's theory was that the effect of bore scrub opened the pattern and lengthened the shot string. Since he talks about bore scrub I think he was talking about cartridges without shot cups but he doesn't so state.


I am glad to be here.