.22 Long rifle MOA required to sight in @300 yards? - RimfireCentral.com Forums

Go Back   RimfireCentral.com Forums > >

Notices

Join Team RFC to remove these ads.
Reply
 
Thread Tools Display Modes
  #1  
Old 04-07-2008, 09:49 PM
REA

Join Date: 
Jul 2003
Location: 
Illinois
Posts: 
539
TPC Rating: 
0% (0)
.22 Long rifle MOA required to sight in @300 yards?



Log in to see fewer ads
Using a BC of .100, 1255 velocity, 40 gr bullet and .224 bullet diameter plugged in to a Ballistic calulator it showed 39MOA drop at 300 yards with a 100 yard zero.

The scope has 125 MOA of adjustment. Is there enough adjustment to sight in at 300 yards? I'm not sure how much elevation is set in at 100 yards from the middle scope setting adjustment. In other works how much come up when the scope is at 63 MOA or half the travel.

I haven't gotten the scope yet, just trying to figure how range I can get first.

Standard Velocity ammo has 47 MOA drop @300 with 100 yard zero.

Thanks.
Reply With Quote
  #2  
Old 04-07-2008, 10:16 PM
martyh@atlanticb's Avatar
[email protected]
NRA Member - Click Here To Join!

Join Date: 
Nov 2007
Location: 
central pa,
Posts: 
2,590
TPC Rating: 
100% (3)
Question

the general rule with long range shooting of any kind if you are given a scope that is 50 moa most shooters think 50 inches of adjustment zeroed at 100 yds. but there are a number of things that can affect that.
Reply With Quote
  #3  
Old 04-08-2008, 12:26 AM
MustangGreg66
NRA Member - Click Here To Join!

Join Date: 
May 2007
Location: 
El Cerrito, CA
Posts: 
359
TPC Rating: 
100% (1)
Send a message via AIM to MustangGreg66
1 MOA is 1 MOA at any yardage, it's the inches equivalent that changes with yardage.
1 MOA at 100 yards = 1.047"
1 MOA at 200 yards = 2.094"
1 MOA at 300 yards = 3.142"
...
1 MOA at 1000 yards = 10.472"

125 MOA seems like a lot for a scope to have, is it a 30mm tube? Are you sure that's not your scope's total movement, like 125 MOA from one end to the other, meaning 62.5 usable MOA?

My brother bought a sightron 6-24 a number of years ago with the intention of mounting it on his Anschutz and shootin in our mini Palma shoots at the range, .22LR at 150, 175 and 200 yards. Well it turns out he didn't have enough elevation to get zeroed at 200 yards. Now that scope had 1/8 MOA turret adjustments and Sightron's website states that their current scopes have 60 MOA windage elevation travel, again, I'm not sure if that's total movement, or usable. It sounds like thats total travel, so 30MOA usable elevation.

My thinking would be you should give it a try and if it doesn't get you there, use Burris Signature rings with the offset package to get some extra angle in the scope.

I just plugged those ballistics numbers into my Sierra Ballistics Infinity I-5 software and they give a total drop from the muzzle figure. At 300 yards the total drop would be 167.25" or 53.23 MOA drop. Now whatever else it takes you to get zeroed since the scope is 1.5 or so inches from the muzzle I don't exactly know how to calculate that, but if you have 125 MOA adjustment like you say you'd have tons of room left. If 125 is just the total movement and uable is only 62.5 MOA then I would think you'd have enough, but you're certainly getting close to the scope's limitation.
Reply With Quote
Sponsored Links
Advertisement
 
  #4  
Old 04-08-2008, 12:27 AM
bscman

Join Date: 
May 2006
Location: 
Western Washington
Posts: 
2,191
TPC Rating: 
100% (11)
Send a message via MSN to bscman
Quote:
Originally Posted by Passinby View Post
I suspect you will need a scope mount with additional elevation since you are talking 3X MOA. 1 MOA is assumed at 100 yards. Triple that for 300 yards.

Divide the scope adjustment MOA by three for 300 yard 125/3=41 MOA adjustment for 300 yards.

Rotsa Ruck
Not quite.
MOA stands for "Minute of Angle" not "this many inches at 100yds" as distance increases, so does the space that a minute of angle "occupies."

Figure your scope has 1/4 MOA adjustments.

One click at 100yds is equal to approximately 1/4" of adjustment, but at 300yds that same 1 click is good for 3/4" of adjustment.

You say that 125moa of adjustment at 100yds is only good for 41MOA at 300yds. MOA doesn't change with distance. If you have 125 minutes of angle at 100yds, you have 125minutes of angle at 300yds.

The difference?
At 100yds, that 125 Minutes of Angle represent approximately 130.8" of adjustment....however, at 300yds and 125 minutes of angle, you have approximately 392.6" of adjustment.

Don't think of MOA as inches--think of it as a slice of pie. The further you get out from the center, the larger the piece becomes...the same is true with MOA. The further you get from the origin, the larger a minute of angle becomes.



Way to beat me to it, MustangGreg66
Reply With Quote
  #5  
Old 04-08-2008, 12:39 AM
MustangGreg66
NRA Member - Click Here To Join!

Join Date: 
May 2007
Location: 
El Cerrito, CA
Posts: 
359
TPC Rating: 
100% (1)
Send a message via AIM to MustangGreg66
Hahaha, yea, took me a little while to run the numbers and all but I squeeked in just under the wire
Reply With Quote
  #6  
Old 04-08-2008, 07:55 AM
REA

Join Date: 
Jul 2003
Location: 
Illinois
Posts: 
539
TPC Rating: 
0% (0)
To be more specific, the super sniper scope is the one in question and is supposed to have 120MOA of adjustment.

On another post Squirrelsniper says he uses one with Burris rings and 20MOA inserts to get full [email protected] yards.

I didn't know the inserts would work in both 1" and 30mm rings.

It now makes me wonder what ranges he can actually stay in the normal range of operation.

It would probably be difficult to go back to 50 or 100 yards with it set up like that.

200 yard setting might be the best compromise.
Reply With Quote
  #7  
Old 04-08-2008, 11:40 AM
DaFrog

Join Date: 
Dec 2007
Posts: 
136
TPC Rating: 
0% (0)
I use a Bushnell Tactical mildots 10x , it has much less elevation then the SuperSniper.

I'm still sighted at 50 yards.

To shoot at 300 yards, I simply use the elevation knob to 32 (pretty much the max on my Bushnell) then use the mildots for holdover. Each mil being 3.6 MOAs, just do the math.

With a Supersniper, you're in heaven.

Last edited by DaFrog; 04-08-2008 at 11:41 AM. Reason: Grammar stuff
Reply With Quote
  #8  
Old 04-08-2008, 01:32 PM
REA

Join Date: 
Jul 2003
Location: 
Illinois
Posts: 
539
TPC Rating: 
0% (0)
Quote:
Originally Posted by DaFrog View Post
I use a Bushnell Tactical mildots 10x , it has much less elevation then the SuperSniper.

I'm still sighted at 50 yards.

To shoot at 300 yards, I simply use the elevation knob to 32 (pretty much the max on my Bushnell) then use the mildots for holdover. Each mil being 3.6 MOAs, just do the math.

With a Supersniper, you're in heaven.

DaFrog,

That's useful information. That would put you about 6" or so low at 100.

Thanks.
Reply With Quote
  #9  
Old 04-08-2008, 06:58 PM
beagleboy

Join Date: 
Jul 2007
Posts: 
20
TPC Rating: 
0% (0)
I'm not really sure of the answer to your question. But i can tell you that last summer I was out with my little girl shootin chucks with her little pink crickett target model w/2-10x simmons aetec scope. The rig is zeroed at 50 yards. My daughter is 6 yrs. old so we would be shootin at about that distance. She will hit a quarter just about every time at 50. Shes been at it since she was 3yrs. So there we were sittin and waitin for her next victim when I glassed one at 425 yards. Well thought I what the heck give it a whirl. I took the gun and aimed what looked to be about a 4.5 -5 foot hold over since there was no wind at all I just held strait over. I squeezed one off. Guess what dead wood chuck! the bullet entered just in front of the ear. My best or luckiest shot I have ever made. Never again in a million years.

Last edited by beagleboy; 04-08-2008 at 07:00 PM. Reason: spelling
Reply With Quote
  #10  
Old 04-08-2008, 09:40 PM
gkn's Avatar
gkn
NRA Member - Click Here To Join!

Join Date: 
Mar 2007
Posts: 
1,399
TPC Rating: 
100% (10)
A couple things to consider:
My high velocity .22LR rounds drop 36 inches at 200 meters (219 yards) when sighted in at 25 yards. At 300 yards it will be a lot more, since you are into the highly parabolic part of the trajectory by then. 22LR rounds are dropping harder than the toilet seat at that point.

The other concept I'm a little less sure of is how the minute of angle adjustments come out for a 22LR at long distance. What I mean is, if a scope that adjusts perfectly so that one click is equal to 3/4" at 300 yards for a 30.06 is placed on a .22LR rifle, it isn't going to be the same for the 22LR with its exaggerated arc, is it? I have never seen this topic addressed, so if someone has a good explanation for what should happen, I'd like to see it.
gkn
Reply With Quote
  #11  
Old 04-09-2008, 12:22 PM
DaFrog

Join Date: 
Dec 2007
Posts: 
136
TPC Rating: 
0% (0)
Here is the ballistic info on a standard velocity round (1050 fps)
To be precise: WOLF ammo Target Match 1050fps

The dope was verified at the shooting range and is correct. It worked in my rifle.

YARDS MOAs
50 - 0
75 - 2
100 - 7.5
125 - 12
150 - 16.5
175 - 22
200 - 27.5
250 - 39.25
300 - 51.50

As you can see , the drop is quite extreme between 200 and 300
Reply With Quote
  #12  
Old 04-09-2008, 01:15 PM
bscman

Join Date: 
May 2006
Location: 
Western Washington
Posts: 
2,191
TPC Rating: 
100% (11)
Send a message via MSN to bscman
Quote:
Originally Posted by gkn View Post
The other concept I'm a little less sure of is how the minute of angle adjustments come out for a 22LR at long distance. What I mean is, if a scope that adjusts perfectly so that one click is equal to 3/4" at 300 yards for a 30.06 is placed on a .22LR rifle, it isn't going to be the same for the 22LR with its exaggerated arc, is it? I have never seen this topic addressed, so if someone has a good explanation for what should happen, I'd like to see it.
gkn

Yes, the adjustments are made line-of-sight...it has nothing to do with what caliber you are shooting or the arc of the projectile.

One click of the scope would chance the line of sight 3/4" in whatever direction you adjusted it.
Reply With Quote
  #13  
Old 04-09-2008, 08:59 PM
gkn's Avatar
gkn
NRA Member - Click Here To Join!

Join Date: 
Mar 2007
Posts: 
1,399
TPC Rating: 
100% (10)
Quote:
Originally Posted by bscman View Post
One click of the scope would chance the line of sight 3/4" in whatever direction you adjusted it.
Line of sight, yes, but point of impact?
Reply With Quote
  #14  
Old 04-09-2008, 09:23 PM
martyh@atlanticb's Avatar
[email protected]
NRA Member - Click Here To Join!

Join Date: 
Nov 2007
Location: 
central pa,
Posts: 
2,590
TPC Rating: 
100% (3)
check out jbm calculations it is interactive.
Reply With Quote
  #15  
Old 04-09-2008, 10:41 PM
husbandofaroman

Join Date: 
May 2006
Posts: 
121
TPC Rating: 
0% (0)
My setup is a Contender G2 pistol with a Bushnell 10x 3200 mil-dot scope. I use my mil-dots out to 250-yards.
bottom of fat line: 50-yard zero
mil-dot 1: 75 yards
mil-dot 2: 100 yards
mil-dot 3: 120 yards
mil-dot 4: 140 yards
crosshair: 160 yards
mil-dot 6: 180 yards
mil-dot 7: 200 yards
mil-dot 8: 215 yards
mil-dot 9: 230 yards
top of fat line: 250 yards

Then I use my scopes verticle adjustment:
250 to 370 yards: 9 clicks (.25moa) for every 10 yards
370 to 450 yards: 1 click per yard

My ballistics information comes form Exbal software running on my Asus pocket Pc.

My ammo is Eley Tenex with a confirmed (with Chrony) .15 bc.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off




All times are GMT -5. The time now is 10:35 PM.

Privacy Policy

DMCA Notice

Powered by vBulletin
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Search Engine Optimisation provided by DragonByte SEO (Lite) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright 2000-2018 RimfireCentral.com
x