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Maximum Parallax Error

During the past few days, I participated in a parallax discussion on another thread in this forum. That discussion stimulated a bit of internet research which uncovered some very interesting results.

I've competed in various shooting disciplines over the years with a wide variety of riflescopes ranging from a 6 power Unertl Small Game scope up to Nightforce 15-55 Competition scopes. All this time, I've assumed that parallax error was a function of scope magnification. This seemed reasonable because the 6-8 power scopes had virtually no parallax error while the much higher power scopes required parallax adjustment for every change in distance.

It turns out that I was wrong. Maximum Parallax error is not a function of scope magnification. Rather it is a function of objective lens diameter. And, there is a formula to calculate maximum parallax error given the diameter or the objective lens, the distance at which parallax is zeroed, and the actual distance from muzzle to target.

Background

I wanted an inexpensive bullet-drop reticle scope for NRL-22. I'm old and slow so I chose a fixed 10 power SFP scope with a 40 mm objective. The low power provides for a wide depth of focus so I could set the focus at 70 yards and not have to take the time to refocus with each change in distance from 40 yards to 100 yards. This part works as predicted. I also assumed, incorrectly in retrospect, that the low power would also yield low parallax error from 40 yards to 100 yards. This assumption was incorrect. Zeroing parallax at 70 yards give me a 40 yard maximum parallax error of .806 MOA and a 100 yard maximum parallax error of .302 MOA. These are not insubstantial errors. Fortunately, I'm good at keeping my eye centered in the ocular.

The Maximum Parallax Error Formula

The parallax error formula, along with an excellent parallax error calculator can be found at https://www.lelandwest.com/parallax...onid=720BD8E8B3FC55A7B6D40669D1B3DFC0.cfusion

JackHughs

Note: I've edited this post to show that we are discussing "Maximum" parallax error. Based on the paper referenced in the following post, realizable parallax error can and will be less than maximum parallax error based on some additional variables. If I can, I 'll reduce the mathematics of realizable parallax error to plain English and post again.

JackHughs

PCP Rifle  SOLD Avenger Bullpup .25 $530

Avenger Bullpup .25 cal for sale. Comes with Utg Swat 4-16x44 Swat Scope and scope rings, 250 dollar value, Airgun Capital moderator, 100 dollar value, barrel extension adapter for the moderator, 2 factory 8rd mags, 2 3D printed 12 round mags, a 3D printed barrel band, scope rail stabilizer, and bag rider. Just had all the seals redone, a trigger job, a new regulator, hammer spring, and valve stem. Couple dings and scratches, but overall in excellent condition. Last picture is 12 shot 20 yd group with 25.4 gn JSB kings. Have “eBay listing as well if you’d rather not deal with Zelle or PayPal. Free shipping lower 48

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PCP Rifle  SOLD Airforce Escape UL .25

Airforce Escape UL .25 cal , $500 and buyer pay shipping, payment with Zelle , has donny fl treaded adapter for moderator, adjustable power wheel , butt pad , ultra lite , weight is about 4lb without scope , power level 10 will produce 70 foot pounds , with 33 gr jsb , will consider a trade for a .25 or .30 caliber airgun , let me know what you got.View attachment 1000001735.jpg

Benjamin  Very Heavy Pellets in the PRod @ 20 Yards

Someone left some 28.5 grain Dae Sung pellets at the range the other day. I think they are for the Korean PCP rifle. I did not try it but I think they are too long for PRod magazine. I have a single shot tray. I shot 18.13 and 14.3 at the same time with the same point of aim. The 28.5 pellets are a wee bit tight loading in the PRod. I think they would be good rat killers..

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Air Venturi  Avenge x Regulator issues

So as I’m new to the forum i hopefully am posting this to the right place.

I recently purchased the Avenge x .25 from Pyramid.
Out of the box directly from them I fired a few magazines and happened to notice reg pressure was rising pretty quickly after it sitting for say 15-30 minutes.
400cc bottle with no less than 3000psi and topped off to 4000psi.
So after a email I was sent a new regulator.
After the degassing first I replaced the regulator with the new one sent to me.
I installed the new one and seated it gently then counter clockwise 1/4 turn per instructions in manual.
Cocked the rifle and filled to 4000psi and as I watched both gauges I happened to notice reg pressure was right at 3000psi again with bottle being at 4000.
Dry fired 5 times and watched the reg pressure drop to 2200 or so and almost immediately rise back to 3000.
So no matter what I do nothing changes.
My understanding was if the regulator was set at 1/4 turn counter clockwise it would be reset to a lower pressure and I could continue counter clockwise to set desired regulator pressure.
Honestly I’m ready to send the whole package back as this was not a cheap investment with compressor,Element Helix SFP and all the stuff needed.
So if I’m going to pick up my rifle after sitting any length of time and I see a crow I want to shoot I need to dry fire to be able to have a consistent velocity to have accuracy?

I know there’s alot of threads about regulator problems but just thought I’d ask since I haven’t had time to read much on the subject.

I need some opinions

Hello everyone. I’d like some opinions on something. I’m in the market for another PCP. A few things first:
I’m not a hunter
My backyard is only 25 yards wide
My house butts up to an arroyo and I’m having an issue with skunks.
I have my eye on either a Gauntlet SL in .30 or an AEA challenger pro in .25.
Does it make sense to buy a .30 cal when the AEA will put out the same (if not more) FPE in .25? What would you guys do?

  • Question
I made my own reticle on chairgun

Long story short, I just found it funny a bit, at first I found a reticle similar to my reticle on chairgun but still looked off somehow, and it kept throwing me off to the point I thought my scope sucked or my rifle is inaccurate lol. Until I found an option on chairgun elite to make my own reticle, long story short I spent an hour or so trying combinations to make it match my own Mrad scope reticle. I did a 70 yard group before hand and I was consistently shooting 5 dots lower. Previously the app was saying only 2 dots holdover. However after I made my own reticle on the app a 70 yard distance was showing a 5 dot holdover just like I experienced today while shooting. I will show you guys my reticle and the one I made as well as the settings I made maybe it helps someone in the future to know that if their reticle is not accurate with their app or not available they can make their own. I think I nailed it with mine albiet it was mostly guesstimating but hey if the poi is the same as where I'm hitting them it's correct right?



I'm attaching also a freehand (I wasn't on a table) group I did at 70 yards as well with some wind 4 shots I think I did ok for a newbie

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Exactly how many is too many

For the last couple years I’ve kind of vanished from the airgun forums / community to follow other interests and hobbies. Now over the last few months I’ve come full circle and rediscovered my love for airguns and modifying them. I’ve jumped from brand to brand, and have held onto my favourites and let the others go. Now for the serious question. How many guns can one own before it becomes apparent that you simply have too many? A few pics of why I’m asking the question. And feeling a bit shameful that that’s not the entire collection.

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Airgun Shooting bench?

Because of construction I've been temporarily shooting off a cheap, wobbly, plastic Walmart folding table on my porch and rear deck. With construction done and the table wobbly and sagging I'm ready to make something better. I want something with a smooth top but some grip. Concrete my preference, is probably too heavy unless I make it very thin. I'm thinking a plywood top but this will be in the weather and I'm concerned about delamination. Perhaps sealing marine plywood?
Any suggestions? What do you use for a permanent outdoor airgun bench?

Thanks
Ron

Just what kind of games do you Englishmen play at the range anyway? 😁

While researching guns and optics and specifically digging up info on the Zulus, I stumbled upon a Youtube video shot on what looked to be a pretty nice airgun range. Now even though I’ve done some little bit of world traveling over the last 20 years or so, I’ll admit to being no expert on accents. However, I feel pretty comfortable saying that the creator of this particular video was an Englishman. So I’m watching this fellow cover his experience with the Zulus while demonstrating it, when the camera pans quickly past a very unusual target. Wait, just what the hell was that? A little further in, AND THERE IT IS AGAIN! I’m kind cracking up a little bit as I continue to watch, and the more this guy goes on about the Zulus while COMPLETELY ignoring what has become the elephant in room for me, really gets me chuckling. A thought then hits me, so I grab a frame of the video showing the cheeky target, circle it in red, and show it to my wife Heidi. You see, Heidi lived in London for a few years in the 80s, eventually married an Englishman, and still cares greatly and maintains a connection with her former in-laws. When I show her the picture and say “This is evidently how your former people spend the day at the range.” she just looks at it, raises an eyebrow, and hits me with… “I’m not surprised.” That of course got me laughing again.

Heres the pic:

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  • Question
Snowpeak  Shroud leak air between barrel when shooting

Hello everyone. I'm a new airgun enthusiast. I've been using gunpowder guns my whole life, so I'm quite familiar with guns.

I fell in love with my friend's PCP gun a while ago and got myself a Snowpeak P35 .22 gun. I got it couble of weeks a go. I have an adapter for a suppressor and a suppressor for it from my .22LR.

When I added a suppressor, I noticed that air comes out of the small holes in the shroud when shooting. I tried to tape the holes shut to silence the gun. But there is no seal between the shroud and the barrel, so air leaks into your face when shooting. Has anyone come across a similar feature? Can the gap between the shroud and the barrel be sealed somehow?

The gun is really nice to shoot. I haven't adjusted it other than the suppressor, except by putting a 2cm extension piece at the back and lightening the trigger spring.
Airguns have come long way from my childhood and are absolute great for shooting and shooting practice.
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PCP Rifle  SOLD WTT .30 Brocock Sonoran w/SUBMOA barrel

Absolutely LOVE this gun and out of the box one of if not the most accurate .30 I have ever shot BUT I HATE the semi bullpup form factor. If I could get a traditional rifle stock for this it would be one I would never let go.

Is a laser with 44.75 as well as 50.15. Has the AoA power tune and upgraded 700cc bottle. Currently shooting the 44.75 a hair under 900 FPS, with plenty of room to go up or down. AoA did a fantastic job on the trigger and is getting roughly 53 shots per fill with the 700cc bottle.

Picked up another .30 RAW which fits me much better…

Let me know what you are thinking trade wise and can go from there.

Or 1850.00 and split the shipping.

Scope/rings, Atlas bipod , 0Db not included

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N/A  My best 23 yard group....today...pretty good.

I decided to work with my 300s today's. It's accurate, I like shooting it, but it's very fussy. I decided to shoot some different pellets for groups first. All 5 shot groups at 23 yards shooting with my buddy Sam and my wife Naomi. Note the group with AA10.3. See the stray pellet above the 5 shots......NO, that was the first 5 shots with the 10.3s, the larger group below was the second group. The second group I had it going but the pressure got me on the last shot,lol. I have a lot of 4 plus 1s but it's not often I can squeeze 5 in like that. The wadcutters I only shot 1 group.
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FX  FX STX Liner Direction


Saw this really interesting video that was posted recently and was wondering if any airgunners out there have tried this method and have results of their own to share with the collective group. I will be testing it out as mine original liner was facing 6 o'clock so next time I got the range I am going to compare it to the 12 o'clock position.

FX Maverick Compact .22
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Diana  Disappointed in 0.22 Diana Bandit power

Don't want to go into detail but it's utterly pathetic at eliminating certain fat pests. Getting extremely poor results with recent infestation flairup. So bad in fact, considering stopping using it altogether for this purpose.

Shooting pretty much point blank at the X mark. No result. Pressure's good, Crossman hollow point pellets. Saw them just ricochet off their heads multiple times. Seems to not have any penetrating power for almost 800 fps.

Idk unless something is wrong with my gun or me. Do I need different pellets?

Filling hose stuck on fill probe even after line is vented

I am having a weird issue. I am filling my AEA Challenger with a bottle.. Gun fills fine.

Once full I shut off the bottle, vent the line but the hose won't come off the rifles fill probe. It comes off the bottle. After fifdling with it for a few minutes it finally popped off but a large burst of air came out, leading me to believe the reason it didn't come out was due to pressure locking it in.

Any ideas? Maybe bad check valve on fill probe? Or is something wrong in the rifle fill port?

Mike

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