I don't know how it's going to block anything out unless you're shooting prairie dogs at 600yds plus. Those stadia lines are barely thin enough to see.
Other than the German 1, 2, and 4 Reticles and variations of same almost all reticles will have some sort of vertical line above the crosshair.
http://www.rimfirecentral.com/rfcftp/optics/Premier_Reticles.pdf
Even without subtensions they are useful for quickly gaging inches if you know the height of the target.
Great link, thank you for adding it to the thread. It's amusing to me that the source is Premier Reticles, a company which no longer exists. It's come to my attention that a Canadian company 'Tangent Theta' absorbed Premier's assets (and all that came along with it), and is now manufacturing 'no-compromise' scopes at a premium price point.
As a math person, and especially along this line of thinking (reticles, subtensions, heights, distance) I really love the name; Tangent Theta. After all, our subject here might as well be applied trigonometry.
WildRose mentioned knowing and using the height of your target for determining holds. I think that is obvious to those who hunt a lot, but I would like to examine it a little more closely, as it applies to reticles - or how we use them at least.
Referencing the coyote hunt,
@WildRose said he dialed his scope in for 600yd. 3 Coyotes appeared, 2 lined up, and got the same bullet. That's impressive, and so exciting I think it wasn't until I re-read his post that I noticed the significance of what followed.
The third coyote started to retreat, and our shooter measured him in the reticle, and used the target's height - about 2' as a holdover. Obviously the shooter understands his trajectory at some subconscious level, and comes to most who practice at varying distances. Pretty amazing shot, considering the size of a coyote's kill box, the range, and the fact it was on the move.
What's most interesting to me is not the result (dead coyote at ~750yd) but how the shooter made that happen with such simplex calculation. This story provides evidence of how a SFP scope can be used to advantage in the field - that is using the hash marks as a reference instead of a value. Thank you
@WildRose, that was a really important insight for me.