Sighting confusion

[Rockhopper]

I have a KK500 and I'm using the sights that came with it.
I shoot at 100 yards, the scale on the side of the sight is five lines from the top.
I shoot at 50 metres, the scale reads seven lines from the top (which is 45 clicks)
All good so far.
When I shoot at 25 yards though the scale reads six and half lines from the top, so it's up from 50 instead of down
My brain tends to explode when I try and understand sight marks and clicks etc but should I be trying to solve this if indeed it's a problem?
Now I know what's going on it's slightly better as a few weeks ago I was shooting in a competition and ran out of rounds for sighters as with my normal seventeen clicks from 50 to 25 it was shooting way too low and I couldn't understand why.

[Daryll]

Its because of the rainbow-like trajectory of .22.

The POI at 25yds is pretty much the same as 50yds (depending on ammo)... that why theres only 1/2 line difference between the 2.
However, after 50yds the bullet starts to drop considerably, which is why you have 2 lines difference between 50 and 100.

Use something like Chairgun, put in your ammo details and you can see on the graph what the trajectory is like.

For subsonic .22rf, zeroed at 25yds, you'll be 1/2 inch low at 50, and nearly 9 inches low at 100

[1066]

Height of the sights above center of bore is important with a .22 when you type in your data.

[Rockhopper]

Yes, but my sight at 25 is higher than at 50 when it should be lower.

[WelshShooter]

Read this article:
https://www.thoughtco.com/rifle-zeroed- ... im-1927071

The picture below shows an example of .30'06, but the same logic can apply for .22lr. When you zero for longer ranges, the bullet will rise above the line of sight and drop onto the target, just like in Daryll's post. However, when you zero for shorter distance such as 25 yards, then the bullet would be hitting the target on the way up to the line of sight (i.e. the bullet doesn't drop from above). The picture below illustrates this, a scope will effectively have two zero positions: the first is when the bullet rises up to the line of sight, and the second is when the bullet falls back down past the line of sight.

[Rockhopper]

Hi, yes, I've realised thats whats happening. I've not experienced it with my two previous rifles so when i was trying to zero at 25 with my normal amount of clicks down and the bullets were landing two inches too low it really stumped me for a while! Strangely no one else in the club appears to have had this happen either!
This is with open sights by the way.

[WelshShooter]

The only variable will be the height of the sights from the bore, as 1066 has pointed out. My Walther G22 has a rail with an extremely high height from the bore (around 4 inches), and the elevation is almost maxed out to get on paper at 25 yards. Good news is that it's more than likely zeroed for 150 yards too!

[strangesam]

With my 15-22 and a co-witness red dot sight, I'm 2.5" low (sight bore height) at 0m, 0" at 25m and about 1 1/4" high at 50m

[Daryll]

With my 15-22 and a co-witness red dot sight, I'm 2.5" low (sight bore height) at 0m, 0" at 25m and about 1 1/4" high at 50m

Being a semi auto, are you using HV ammo with that..?

HV ammo could be still rising at 50m, where as match (subsonic) ammo will start dropping sooner.

[strangesam]

yep.. range is only 50m long though so never bothered working out the trajectory past that.

and as long as I remember to aim a bit high at really close ranges its accurate enough for practical