zeroing issues with iron sights on a sr 22.

happykal

happykal

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My sr 22 rifle with irons wont zero for 15 yrds. I have a magpul mbus pts front sight and a Knights Armament Corp rear sight. The Kac is designed for a 223 to zero and just twist the sight to raise the rear aperture to adjust for yardage to where you want to be on target. It's numbered and basically fool proof for a .223. Original plan was 15 yard zero with the KAC sight in the Z, lowest position and then play around to see what number to place it on to reach out at certain distances. For example the 200 yard setting might be 50 yards for a .22, the 300 yards might be 100 yards. Ya follow? Any ways at 15 yards I'm always like 3" low. Front sight post lowered all the way down and rear sight raised all the way up. Defeats the purpose of the sight really. I can get a zero with my UTG front fixed sight, but same deal. Front sight post lowered all the way down rear sight all the way up. I had that problem with the stock barrel and now with the Tactical solutions barrel. No barrel block. I ordered on from dlask with hopes it'll correct it.

Has any one else had these problems or can offer some advice by all means.

on a good note my bushnell trs 25 is awesome. Had it for 3 years now and the only problems i've had is I broke the rubber lens cover and the batteries have died twice. One time I left it on 2 setting for 24 hours and it worked for another may be another twelve hours of use. I was shocked at the battery life, but was mad when it died when i was trying to get a rabbit. Did not take the shot. I had one bad experience with a wounded rabbit and will do my best to prevent wounding again. I hate that noise.
 
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Try a 25 yard zero. There is such a thing as trying to zero a rifle too close. The sights are well above the barrel axis, and at 15 yards the angle from the barrel to the point of aim at 15 yards is large, while at 25 yards, this angle is much smaller. Try a 40 yard zero too, as that is a practical zero for a .22 rimfire cartridge.

If you used a 15 yard zero, the trajectory of the bullet would be several inches above the line of sight at 50 yards, and thus you would have to LOWER your sights to hit a 50 yard target. The sights on the M-16 type rifle are approximately 2 1/2 inches above the bore line of the rifle barrel. This means that the bullet has to travel upwards that distance within 15 yards, so the angle of departure of the bullet is quite high. At 50 yards, the bullet is still going upwards and somewhere around 60 yards it starts to come back down in it's trajectory. I am not exactly sure just where it will cross the line of sight again without running a ballistics program, but it will probably be somewhere around 125 to 150 yards. Thus your Zero would be 15 yards and 125 yards

Another reason could be is that you are simply using an inappropriate sight, and expecting too much from it.
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X2! The range is way too close.

You may also find that once your gun is zeroed that you run into another set of difficulties.

Because your 22LR is still climbing in altitude out to say 50yds-60yds you will bee shooting low....but then your bullet starts too fall off and you will need elevation to hit at 100yds.

The arc of a 223rem means its climbing out past 100yds and then falling off.

If your sight only goes to 300yds it may not be enough @ 100yds with 22LR ammo.


AH crap! Buffdog you beet me to it!.....you did a better job than I at explaining the same thing I was driving at though. LoL....great minds.... ;)
 
buffdog said:
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Try a 25 yard zero. There is such a thing as trying to zero a rifle too close. The sights are well above the barrel axis, and at 15 yards the angle from the barrel to the point of aim at 15 yards is large, while at 25 yards, this angle is much smaller. Try a 40 yard zero too, as that is a practical zero for a .22 rimfire cartridge.

If you used a 15 yard zero, the trajectory of the bullet would be several inches above the line of sight at 50 yards, and thus you would have to LOWER your sights to hit a 50 yard target. The sights on the M-16 type rifle are approximately 2 1/2 inches above the bore line of the rifle barrel. This means that the bullet has to travel upwards that distance within 15 yards, so the angle of departure of the bullet is quite high. At 50 yards, the bullet is still going upwards and somewhere around 60 yards it starts to come back down in it's trajectory. I am not exactly sure just where it will cross the line of sight again without running a ballistics program, but it will probably be somewhere around 125 to 150 yards. Thus your Zero would be 15 yards and 125 yards

Another reason could be is that you are simply using an inappropriate sight, and expecting too much from it.
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Click to expand...

I figured I was to close. I used to have a 30 yard zero with my red dot but trying to shoot a spruce grouse up close 10-15 yards I basically made him do the Mexican hat dance... I was trying to head shot. I just got the irons and wanted a closer zero. I guess my alternative is to just learn my hold over after a 50 yard zero again. but thanks for the advice.
 
Is your upper rail level and parallel with the receiver rail? Barrel isn't canted in chassis? Forend square to chassis? If all that is good then I would match the sights with the same brand. Either magpul rear or KAC front. Actually now that I think of it maybe the pts is out of spec?
 
supernova said:
Is your upper rail level and parallel with the receiver rail? Barrel isn't canted in chassis? Forend square to chassis? If all that is good then I would match the sights with the same brand. Either magpul rear or KAC front. Actually now that I think of it maybe the pts is out of spec?
Click to expand...

Magpul front and Kac rear sight. And every thing looks good.
 
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