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Centerfire Rifles - Semiautomatic or Gas Operated Centerfire rifles, carbines and other gas operated rifles.

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  #1  
Old 08-01-2010, 11:33 PM
aybyman aybyman is offline
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Default Best range to zero a .223 rifle?

I zero'd my rifle at the 50yd last week, but when I took it to the 100yd range, it seemed like my shots were all hitting low. Does that follow the normal bullet trajectory?

What should I zero my rifle at, the 50 or 100? Rifle will be used for self defense in SHTF scenarios. If I were to zero it at the 100, what would happen when I brought it back to shoot at the 50 yd range?

Last edited by aybyman; 08-01-2010 at 11:35 PM..
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  #2  
Old 08-02-2010, 1:42 AM
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Depends where you live. If you live in the Sacramento area Sacramento shooting center is a great place because you can change the distance of your target easily. It's a good idea to zero it at 100 yards.
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Old 08-02-2010, 1:47 AM
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Know your holds.

If you just like being on target at the range, do the 100yrd.
If you really want that SHTF zero, keep it at 50yrds. and practice your holds at different ranges/same zero.

Some people also like the 25-300yrd zero as well. I like that with my shorter guns.
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  #4  
Old 08-02-2010, 7:00 AM
aybyman aybyman is offline
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Where would I need to aim on a 100yd target if I wanted to hit the center of it if I zero'd at 50yards?
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Old 08-02-2010, 7:07 AM
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If you are zeroed at 50yrds then you should be hitting about 1.7-1.5 inches low with 55gr bullets and about 1.6-1.4 with 62grain. Reference here http://forums.second-amendment.org/i...hp?topic=636.0
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Old 08-02-2010, 7:12 AM
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My optic is zeroed at 25yrds but I can still hit point of aim/point of impact on steel targets at 100-400 yards.

Some carbine/rifle courses zero at 25yrds or 50yrds.
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Old 08-02-2010, 7:26 AM
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Quote:
Originally Posted by aybyman View Post
Rifle will be used for self defense in SHTF scenarios.
If I recall correctly, in the AK-47 instructions, after sighting in the AK, the manual said you can hit a 16" target anywhere from 0-1000 yards. I don't dispute the claim, but was amazed at the 16 inches.

If you are really concerned about SHTF self defense, think about the application and accuracy requirements. Are you trying to go for the left ventricle or aorta? Are you aiming for the pupil or the iris?

Now if you were hunting squirrels at 50-100 yards with a .22lr, it makes a huge difference, but with a .223, if you sighted in at 100 yards, you are easily good to go from zero to 200+ yards and 2-3 inches aren't going to make a bit of difference for self defense. (unless you are defending yourself from zombie hummingbirds).
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Old 08-02-2010, 8:01 AM
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Zombie hummingbirds eating my brain nectar through my ear. Thanks rsrocket1 for giving me another zombie creature to be on the lookout for.

Agreed. zero at 100yrds and you should be pretty much good to go at any practical range you would use the rifle at.

Comparison to other military calibers
Cartridge Muzzle velocity 200 yards drop 200 yards velocity 400 yards drop 400 yards velocity
.223 55gr M193 3073 fps 2.2 inches 2353 fps 27.8 inches 1743 fps
.223 77gr OTM 2679 fps 3.3 inches 2216 fps 32.7 inches 1810 fps
6.8 SPC 115gr SMK 2650 fps 3.5 inches 2143 fps 35.4 inches 1677 fps
6.8 SPC 110gr V-MAX2650 fps 3.3 inches 2208 fps 31.1 inches 1811 fps
7.62x39mm 2300 fps 3.3 inches 1787 fps 53.8 inches 1324 fps
.308 168gr SMK 2600 fps 3.4 inches 2235 fps 32.3 inches 1891 fps

Typical trajectory information from carbines with drop and velocity calculated at sea level with a 100 yard zero.[1]

Last edited by Bogart; 08-02-2010 at 8:04 AM..
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Old 08-02-2010, 8:04 AM
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Hmm...that chart didn't format correctly...check out this link. http://demigodllc.com/articles/6.8-m...s-carbine/?p=7
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Old 08-02-2010, 1:14 PM
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300 yard zero. Then you get 10" window to 360 yards, ie, -2.5" at 0 yards, +5" at 175 yards, and -5" at 350 yards. That's the actual trajectory, you need to add in 'your' ability to hold a group at distance, but lets say for example, you can hold a 4" group at 300 yards, add +/-2" to the 10" window for a 14" hit zone. You hold in the middle of a 14" target from zero to 350 yards, it will be a hit.
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Old 08-02-2010, 1:24 PM
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Keep in mind there are two zeros. In the example of a 25 yard zero, the second one occurs at about 360 yards. For my 300 zero, the first one is at 35 yards. You can get your zero close at 25/35 yards, but you need to shoot it at 300/350 to really know where it's at.
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Old 08-02-2010, 3:09 PM
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If I lived in the desert, I'd zero at 300. In the suburbs, prob. 200, in a Calif city, 100. Don't think I'd go to 50 unless I lived in NYC.
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Old 08-02-2010, 3:21 PM
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Quote:
Originally Posted by aybyman View Post
I zero'd my rifle at the 50yd last week, but when I took it to the 100yd range, it seemed like my shots were all hitting low. Does that follow the normal bullet trajectory?

What should I zero my rifle at, the 50 or 100? Rifle will be used for self defense in SHTF scenarios. If I were to zero it at the 100, what would happen when I brought it back to shoot at the 50 yd range?
Something's not right. With zero at 50 yds, you should be hitting above bull's eye at 100 yds.

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Old 08-02-2010, 5:30 PM
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Use this -

http://www.handloads.com/calc/

Measure your sight-height. It makes a big difference. The ballistic coefficient calculator is on the left if you don't know it.

You can zero to any range using any distance. If you want a 100yd zero and only have a 25 yd range, adjust your sights so your POI is 1.26 inches low at 25 yds. Then you'll be on at 100. That's with the variables I put in. Yours may vary.

You'll get your entire trajectory with measurements. No, it's not normal to be low at 100 with a 50 yd zero unless you're sights are very close to the barrel or your velocity is low. Are you shooting reloads?

I wouldn't get too caught up in worrying about 1" high/low for self-defense. If you miss the middle button, you'll still hit something. You're more likely to miss left/right anyway. I would focus on keeping your gun clean, use reliable ammo, know how to keep your gun running if FT-something happens and getting your head right if the time comes to actually pull the trigger on someone.
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Last edited by olhunter; 08-02-2010 at 6:07 PM..
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Old 08-02-2010, 6:36 PM
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Here is what's on the side of my AR's, all use the same Trijicon Accupoint 1-4, which is what I use for 3 Gun competition. This for my scope (height over bore axis) on my rifle, with my barrel lengths, and with my loads, it gives the sight picture of my scope to hold for 0 to 350 yards for a 14" (LaRue) plate. You need to figure it out for your scope, barrel length, load and group size. Top is range, middle is sight picture to hit center, and bottom is actual difference to center. It accounts for my ability to hold a 3" group at 300 yards. Beyond 350 yards, I have to figure hold over based on sight reticule and range, at which point you need to laser the distance and know what your scope reticule means to point of impact.

Last edited by HighLander51; 10-30-2010 at 9:26 AM..
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Old 08-02-2010, 6:40 PM
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Great job on doing your homework for the TR24. The reticule's not exactly the easiest to use for holdover and it looks like you have a formula that works for you.
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Old 08-02-2010, 6:48 PM
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Quote:
Originally Posted by zman View Post
Something's not right. With zero at 50 yds, you should be hitting above bull's eye at 100 yds.

I think I'm gunna switch over to the 50yd zero now from the 25yd zero. thanks for the graph.
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  #18  
Old 08-02-2010, 6:51 PM
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Quote:
Originally Posted by rsrocket1 View Post
If I recall correctly, in the AK-47 instructions, after sighting in the AK, the manual said you can hit a 16" target anywhere from 0-1000 yards. I don't dispute the claim, but was amazed at the 16 inches.
The 7.62x39mm sighted in 3.4" high at 100 yards will be 105" low at 500 yards. You can it a 16" target at 1,000 yards........................if you aim about 80 feet above the target.
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