Thanks Bruce,
Could you recommend a scope with the Horus reticle? I've been looking at them and it doesn't seem like there's a single option out there for under $1,000, and few under $2,000. I'm not afraid to spend the money, if I know I'm going to be getting something good.
If I'm used to using mil-dot scopes based on MOA adjustments am I in for a learning curve with switching over to mils?
Horus vison sells the Hawk model for $650. It's H425 reticle is calibrated for 12 mils of drop which is over 40 MOA.
If you understand mil-dot you shouldn't have a problem with the Horus reticles. Generally the knobs are only used to zero the scope. All measurements are done in mils.
All sighting methods have limitations. The limitations may be largest from lack of precision. Or they may be from the inabilty to measure the various parameters which casue point of aim to differ from the point of impact. Or they may just be too slow to be practical to use.
What system is fastest? No question, it's point blank shooting. Use a flat shoooting bullet with low wind drift and limit the range to under 300 yards. Put the sight on the target and fire. The bullet will fall witthin a known radius in any reaonable conditions.
If the radius is too large, shorten the distance.
Target knobs give the most precise adjustments. But to use them you must gather precise drop, inclination, air density, cant, and wind information. It's perhaps the slowest system to set up. It's the primary method for military snipers.
Mil grid (Horus Vision) Essentily like target knobs, but a grid reticle is used instead of moving a single crosshair with knobs. It's faster to use than target knobs, and has special benefit for second shot corrections where both the target and the first point of impact are visible on the grid. The fact the grid is in mils is not particularly important, but it must be readable to be of use. It's not a good choice for low light where target knobs can stilll be used.
Ballistic calibrated reticles. As on some miltary scopes. Ballistics calculations are built into the reticle for specific ammo. Measure orestimae the distance, guess the wind. Move the scope to the appropriate place on the reticle Fire. A good tradoff of speed and accuracy at medium distances.
Ballistic calibrated knobs. Like ballistic reticles only slower since it needs target knob adjustments with change of distance or wind.
None of these automatically correct for shot inclination. Some scopes have a built in level to minimize cant.
You can also close your eyes and use "The Force". I've not had much luck at that.
None of these scopes are useful if downrange wind deflection is the major source of error. Shooter skilll in observing the subtle effects of downrange winds is all that's currenly available. That takes lots of practice.
What's in the future? All of the needed sensors could be placed in a rifle scope including downrange wind sensing at least as good as a skilled human. Such instrumentation has been demonstrated. I don't know of any commercailly available.