Thanks for the input, guys.
I understand(and have used) the "small" dirty reticles like the Aztec in
@L.Leon's post(or the 3 or 4 holdover lines on a Hawk AMX reticle), but the larger Christmas tree style reticles(that go down to 10 mils or so) just seem like clutter.
I guess my point is that if shooting conditions(wind, distance, etc...) are such that you have to use THAT MUCH hold over and hold off away from center, the shot will probably be "just a poke" and maybe shouldn't be taken. And, if you ARE just taking a "poke" shot or trying to "walk" your shots, the dirty reticle may obscure your view of the impacts that you need to make adjustments. Plus that fact that most of these type shots would be taken at longer distance requiring higher power magnification that most of the dirty reticle would be out of the field of view(if using a FFP scope). Also, the part of the dirty reticle that IS in the FOV at high magnification could mainly be used just for bracketing(dots too far apart to provide useful aimpoints). Both of which are demonstrated in the 1st pic in @dizzum's post.
Also, unless you have your scope/gun very level, you are more likely to miss a good bit to the left or right on any substantial(>5 mils) holdover shot.
On another note, I don't understand the need for a dirty reticle on scopes which advertise how "great" their turrents are for clicking either.
I have shot HFT, 50 and 100 yard benchrest, hunt and pest out to 125 yards, and shot slugs at steel out to 250 yards, I've rarely seen a use for the dirty reticle(using FFP and SFP scopes), especially any thing below 3mils. I also don't often use over 20x magnification either. Maybe someone has specific examples of when and how they use the lower half of one of these Christmas tree reticles. Perhaps I am missing something?