You go look at the pictures Tango posted.......what in the hell is natural about that? Then toss in the fact that you are standing on an un-level possibly slippery surface with maybe a tree on 2 throw in....................
I'm not arguing against a natural position as a matter of fact that's what I'm suggesting.
find whatever works for you and practice, practice, practice.
But competition range techniques are a completely different ballgame.
IMO, good off hand field shooting has more in common with current combat/SD techniques taught today which BTW have little in common with range stances and most of the old school rifle instruction.