Tunnel of death
- Thread starter opeagle
- Start date
Frank was referring to the rapid ranging system at the top of this reticle, which is Zero Compromise Optics’ new MPCT3.
Basically, left side is for a 12” target, right is for an 18”. If an 18” target fits within the “tunnel” at the point marked with an “8,” then it’s at 800 yard. A half-size (6” or 9”) target would fit between the middle line and the appropriate left or right side bracket.
It’s an old concept that works well for rapid, rough range estimation.
Basically, left side is for a 12” target, right is for an 18”. If an 18” target fits within the “tunnel” at the point marked with an “8,” then it’s at 800 yard. A half-size (6” or 9”) target would fit between the middle line and the appropriate left or right side bracket.
It’s an old concept that works well for rapid, rough range estimation.
Magnification does not matter on a Front Focal Plane. Reticle size will change with magnification change.
I'm familiar with the old ranging concept, having used that b4 with mils and chin to beltline possibilities.
I like the tunnel. Really curious what data led to the 12 and 18" choices.
Working out how I can use it on some game animals.
I like the tunnel. Really curious what data led to the 12 and 18" choices.
Working out how I can use it on some game animals.
18” = average shoulder width of a person
9” = average head width of a person
12”/6” = common target sizes in competition and are easily estimated against for common objects.
The Army does the A1st 12” deal too, head to high chest where the should curves is 12” and their RTE is based on 12” too
but as noted above, head, shoulders, etc.
I think the word was Funnel not tunnel but I get it lol
but as noted above, head, shoulders, etc.
I think the word was Funnel not tunnel but I get it lol
Rapid target engagement
it’s the 12” drill to flash mil a target and provide a hold at the same time.
most common is calling the rifle a number like wind, but for ranging, it’s a 10 Gun, so if you mil it to 6 for yards the hold is 4 which is an oversimplification but that is basically how it works.
the top lines in the Horus help with this, but the use 12” as the head and shoulder reference.
it’s the 12” drill to flash mil a target and provide a hold at the same time.
most common is calling the rifle a number like wind, but for ranging, it’s a 10 Gun, so if you mil it to 6 for yards the hold is 4 which is an oversimplification but that is basically how it works.
the top lines in the Horus help with this, but the use 12” as the head and shoulder reference.
Everything pretty much explained already, but I'll touch on a couple things.
18" wide is common measurement for shoulders and is a standard 100% IPSC. 12" width is 66% IPSC width or about chest width. If ranging an 18" wide target, bracket within the funnel left and right edges and read your target distance on the right hand side. Same for a 12" wide target but read on the left.
We included the centerline for two advantages; 1. help ensure the reticle bisects the target top to bottom to get the true width instead of being slightly canted and getting a range error and 2. So that you can range half size targets (6" and 9") with the same system. Six inch is common measurement given for head width and 9" is common for head length front to back. Plus, a 50% IPSC is also 9" wide.
For strictly PRS competition this obviously isn't needed as all ranges are given to competitors. But there are more comps than PRS, ones where mil ranging is still used for at least one stage, usually on the clock. If those targets are either of these four, speed and efficiency will be increased.
Lastly, our scopes are reportedly being checked out by some mil personnel. This flash mil concept with four different widths may prove more beneficial as distances are a direct read out.
The concept has been around a long time as pointed out already. We just tried to enhance it for common sizes based on width instead of height, and more versatility as well.
Hopefully that helps explain a bit for the "fatal funnel" as I started calling it. (Yes I know that term is used for room clearing procedures). ??
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