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Posted: 5/29/2010 7:37:11 AM EDT
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I originally asked this question in the Armory under General Firearm Discussion....but so far haven't really gotten the answer I'm looking for.
I have a CAI VZ-2008 (VZ-58 clone). As most of you know, the sights are much like an AK's. ***EDIT**** I guess they're not.  ***
I read an article about sighting in the irons on AKs at 25M (82 ft) and did so with my VZ. The article said to do this with the rear ramp set on 1. However, after zeroing at 25M with the ramp on 1 and getting 5/8" 5 shot groups....when I went to 100M I was shooting about 9" low....decent grouping...just low. This was with the rear leaf sight still set on 1. Obviously, I don't understand the trajectory of the 7.62x39 round (this is my first rifle in that caliber). Any help explaining this to me would be appreciated. Was the article correct about having the rear leaf sight set on 1 or should I have set it on U to sight in at 25M? Since the U setting is higher than 1, if I sight in at 25M on U, and then move to 1, that would make the bullet impact drop significantly more, wouldn't it? Does that mean I should sight the rifle in at 100M with the rear leaf sight set on 1? I'm assuming so (if I want to be able to use the rear leaf sight as it is intended)....but I wonder why the article was telling me to do so at 25M? Maybe so I could get the groups down tight enough that I could more easily tell if I needed to adjust windage/elevation? Like I said, at 25M with irons, I was getting 5/8" 5 shot groups. At 100M, thIs rifle is only rated to be 8MOA though most shoot much tighter groups (mine seems to be 4-5 and I am not a good shot....I think a better marksman could get my particular rifle down a few MOAs). Since group size for me is on the order of 4-5" at 100M, I'm guessing the 25M recommendation was to 'dial in' the sights with more accuracy/repeatability than a 4-5" group (with irons) would allow at 100M, correct? Here's a pic of the rifle if it helps you understand the sights (as I said, very similar to AK style sights). 
TIA, Sean |
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' Any help explaining this to me would be appreciated'
Physics will be of no help in this case since metaphysics are involved. With a standard AK and ammo, sighting in at 25 with the sight on '1' will make you a little high at 100. IIRC, it's 1" low at 25 and 1" high at 50 with this trajectory. Your rifle sights must be set up differently than an AK, so the previous advice to just zero at 100 with the sight on '1' is correct. Then you could go back to the 25 yd range and fire without changing anything and see how it comes out. |
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