Yep, know all about KNOTS, learnt about them as a boy scout. You could heat the barrel red hot and maybe tie it in a knot.
Now barrel NODES are a different thing, as the No.4 is a bit stiffer than the No.1, it's a bit harder to guess, but with the No.1 it is where the barrel band is located.
I once did an experiment using a moveable weight, 1'' from end of muzzle, 8'' from muzzle, 16" from muzzle, but that was not on an enfield and was a stiffer barrel and 28" long.
Jim sweet wrote something about this in an early (303) edition of Competitive Rifle Shooting, I do not have that article.