GTA
All Springer/NP/PCP Air Gun Discussion General => Air Gun Gate => Optics, Range estimation & related subjects => Topic started by: IanC on May 27, 2021, 10:57:13 AM
-
I have a .22 cal HW95 which I installed a Williams receiver aperture sight and am using the factory globe front sight with post insert. After having to tweak the barrel a bit I am getting some really nice groups. Just wondering how others estimate range. I work in a warehouse so brought the rifle in to do the initial set up at 16 yards since that's the distance I have to work with. I was able to produce 16 yard standing groups within an half inch CTC so am really happy with it. I then went out back and set up a target at 25 yards and was puzzled when all my shots were now hitting 2" higher than at 16 yards. Also when shooting at 8 yards in my basement my shots hit an inch high at that distance.
Should my shots not be shooting lower at 25 yards and beyond versus higher?
Do most of you hold your front sight over/under on targets or adjust the placement of the sight in your rear sight when adjusting for distance?
I purchased a basic rear sight from pyramid air so adjustments aren't really the easiest in the field.
Most of my shooting will be from 5-35 yards after that distance my accuracy sort of falls apart with Irons.
-
16yds is your close-zero. You're having to aim 'up' to shoot a bullseye at that distance, so you're pellet is traveling up on its way to 25 yds. Continue increasing the distance to the target, and you will see the pellet begins to fall. I suspect your far-zero will be ~30yds.
There are many posts related to this, so do a little browsing online and experimenting with you gun.
I have never used aperture sights, but you should be able to find the settings needed for different distances-to-target.
-
Jentry
Thanks for the response and the tips on pellet arc.
I did a little looking online before posting and found some info on error and windage but not a lot on elevation.
Hopefully I can get out on Sunday and play around with it a bit. No doubt I will be able to figure it out myself, perhaps I will do an updated post sometime with my findings for others on here.
-
Jentry
Thanks for the response and the tips on pellet arc.
I did a little looking online before posting and found some info on error and windage but not a lot on elevation.
Hopefully I can get out on Sunday and play around with it a bit. No doubt I will be able to figure it out myself, perhaps I will do an updated post sometime with my findings for others on here.
If you have a chronograph you may find the Chairgun program to be very helpful in describing the arc, & determining holdover
at different distances.
Although intended for scope users the program can be applied to iron sights simply by substituting the height of your aperture above bore center line for scope info
The Chairgun App is free and can be found in the Apple Store & Google play
Hope this helps
Ed
-
Pellet is still climbing at 16 yards, hasn't started dropping yet. I have some big springers the 25 yard zero is the same at 50yards. But after that they really start to drop
-
Something isn't right, the information doesn't make sense. Unless the gun has barrel droop and the Williams is wound all the way up. Even then the pellet from that gun would be dropping at 25 yards after being zeroed at 16 yards. Normally with open sights the sight line isn't much over the bore. It's less than an inch. The only time climbing and double zeros are noticeable is with a scope. That's because the sight line is mounted much higher over the barrel. With medium mounts its usually about 1.5". It can grow to 2" if you use high mounts or adapter raills.
It's likely you shooting conditions are different at each distance. If you are shooting from different rests, table heights or even adding a jacket into the equation your POI will change on a springer.
The best way to get an idea of you trajectory is to set out multiple target boards at various distributors from the same shooting station.
-
Since you are using the post insert in your front globe, you may want to try the 6:00 hold sight picture.
I have the majority of my "non-scoped" guns set that way.
(https://www.nrafamily.org/media/922351/six-o-clock-hold.jpg?preset=list720)