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Posted: 2/18/2009 2:08:03 PM EDT
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I've got a Yankee Hill A2 rear sight, # YHM-643K, and I'm having a hell of a time understanding this thing.
This One I thought you were to zero it at 300 meters, using the small apature and with the sight bottomed out and at "6/3," and then the zero would track to 400, 500, and, after one complete revolution, 600 meters. The thing is, there's a "Z" mark, which I take to mean "zero" between the lowest position (6/3) and 4 marks. This blows my theory all to hell. Also, I understand that the small aparture is for long-range and the large one for close range. But, I can't seem to find info on exactly what that difference is in minutes of an angle. The Maryland Shooter's Association website gets me pretty close to understanding this sight, but I'm obviously not there yet. HELP! Thanks. |
| I'm not totally familiar with this particular sight however in the military the "Z" is used when zeroing M-16A4's with a 20 inch barrel and removable carring handel. If you are zeroing an M-4 using the removable carring handle you do not use the "Z" you keep it on the 3/6. So if you have a 14.5 inch barrel or 16" do not use the "Z" when zeroing but if you have a 20" barrel then use it. hope this helps |
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Shooting POA = POI at 25meters with the rear sight set at 'z' will approximate a 300m zero when the elevation dial is turned back to 3.
U.S. Marine Corps Zeroing Procedure |
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Quoted:
Shooting POA = POI at 25meters with the rear sight set at 'z' will approximate a 300m zero when the elevation dial is turned back to 3. THAT'S the part I was missing! Thanks for your replies –– and thanks for the very helpful link too. The only piece left that I'd like to understand is the relationship between the two apertures. Say, for example, you use the small aperture and the U.S. Marine 300 meter zero. Where will the poiint of impact be when using the large aperture? Or, maybe a more realistic example, where would each aperture print at 100 meters after zeroing at 300? Pretty clever little sight once you understand it! |
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Quoted:
Quoted:
Shooting POA = POI at 25meters with the rear sight set at 'z' will approximate a 300m zero when the elevation dial is turned back to 3. THAT'S the part I was missing! Thanks for your replies –– and thanks for the very helpful link too. The only piece left that I'd like to understand is the relationship between the two apertures. Say, for example, you use the small aperture and the U.S. Marine 300 meter zero. Where will the poiint of impact be when using the large aperture? Or, maybe a more realistic example, where would each aperture print at 100 meters after zeroing at 300? Pretty clever little sight once you understand it! Read through the whole thread linked above. 
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