5thShock has it right basically .
i'll just help him out some and add ,
that it is done at 100
METERS . the closer you are to 109 yards between muzzle and target the better . the rear site on -3- . ajust the front site to hit centered at +10" above POA .
dont worry about variations in otherwise nominal ammo or of temperature , yet .
make sure any muzzle-device is tight or get rid of it . they can really open up groups if they are the least bit loose .
bayo off . if attached folding spike , close it .
if ajustment is needed , move only one direction at a time then try another group . like , ajust for elevation and try a group . then , ajust for windage " " . 1 full turn of an AK front sight post = 8.5" movement @100M . 1mm movement of the "slide or drum" = 10" @100M .
(BIG HINT HERE) the chinese tool has 1mm threads on the pusher part .
often , the frontsite slide or drum will be "staked" in place . many have bent the chinese tool trying to overcome the stake and , of course , blamed the tool
if staked or just plain frozen its best to drive it back and forth
a little with an appropriet hammer/punch . i made some woodblocks just for this purpose because its easy to bend the "ears" just whacking at it against a table .
you cant rightly site-in off your elbows . THIS is supposed to be all about your weapon and this ammo , not you . use sandbags or a machine . many people are shocked to find their AK mechanicly way more accurate than they are when you make them shoot off sandbags properly
different ammo has widely different POI with AKs and SKSs . i've measured 19" @100M total of elevation POI diff from an AK between all the ammo ive tested . 12" of POI between common brands widely available now . this has nothing to do with exterior ballistics but where the barrel is pointing at bullet exit .
the +inches for the other site settings @100M should hit close too :
-1- , 100M = +0.0" @100M
-2- , 200M = + 4" @100M
-3- , 300M = +10" @100M
-4- , 400M = +17.5"@100M
-5- , 500M = +27" @100M
if your bright enough to have plumbed a line on a big 100M site-in target , you can check for left/right windage anomallies in your rear sight now and head off wondering where those 400M shots go .
yes , the rear seems loose to forced windage movement while static but thats not a problem . you see , thats governed by gravity-up-a-ramp . the rearsite jumps right off the ramp every shot and is so 're-set' . i suspect the idea behind this is to aid keeping it clear of debries . its THE RAMP that determines L/R consistancy PROVIDED the clasp-spring on the range-slide is strong .
the soviets had some complex mathmatical formule to determine "group center" . just use the old army way and that works fine . disreguard an obvious flyer for groupcenter calculation .