Calculation of 1 MOA at 100 yds

[Shoobee]

Primer on long range shooting (steps) --

- Do your homework and learn about ballistic coefficients and calibres;

- Choose a calibre (there are only 2 really good choices: the 7mm or the .308);

- Choose a size within that calibre (depends on your favorite game animal);

- Choose a rifle (Remington etc.);

- Choose a scope (Leupold etc.);

- Center the cross-hairs within the scope BEFORE MOUNTING IT;

- Center the scope on the rifle mount (with rings and bases) using a laser boresighter and then after tightening, glue it with locktight or clear fingernail polish;

- Sight-in the rifle at 100 yds (the laser boresighter should put you on paper at least at 100 yds; at shorter than 100 yds the parallax may throw you off);

- Zero the dials on your scope for the 100 yds setting;

- Create a range card for the area (average atmospheric temperature and topographic elevation) of your likely hunting/shooting location;

- Tape/laminate the range card to your rifle stock someplace where you can easily see it;

- Set your scope for 100 yds, or 150 yds, or 200 yds, or 250 yds, or 300 yds depending on your own preference and needs and your expected shot (there are some applications where you could set it for 700 yds, it all depends);

- Practice, practice, practice.

[cfusionpm]

If you have an Android phone, the Strelok ballistic calc is a pretty good, free estimation tool. The first time I used it, it was off by about 1.5MOA each time. But I spent a decent amount of time plugging in as many variables as I knew into the settings (elevation, temp, pressure, windspeed, more accurate cartridge info, etc), and it got me right on target at 300 after zeroing at 100. It will tell you in Mil/MOA/clicks how to adjust, as well as showing your reticle (bunches of pre-loaded options from popular scopes, including my NF NP-R1), and what distance relates to each tick mark. Very nice for a free app.

https://market.android.com/details?i...LnN0cmVsb2siXQ..

[G-forceJunkie]

Actually its 6280.18 but it is often rounded to 6280 or 6400. 1 moa is also 1.0427" but it is often rounded to 1". With all this rounding off, you can get a errors in caculations, or two different schools teaching different numbers.

And that there are 6400 mils in the circumference of a circle, equivalent to 360 degrees.

[IVC]

My factory, out of the box 700 SPS Tactical shot 1/2MOA just yesterday:

So guns do shoot/kill people...

[Shoobee]

...I was talking about real world testing which indicated that the bullet spread stays consistant as long as the ammo and everything else is consistant too. Wind only plays a factor on precision if it is inconsistant. Wind will alway play a factor in accuracy though.

Nothing ever stays constant though.

I have noticed that the gun itself warming up from shooting it is a major variable for what happens downrange.

The atmospheric temperature also changes by the hour.

The atmostpheric pressure changes by the day.

Topographic elevation changes by location, even within a hunting zone, from 5000 ft to 9000 ft or more.

And so forth.

Canyon Country (Utah ???) must be the same as everyplace else on God's Green Earth.

[btw: "consistent" has no ants in it.]

[Shoobee]

So guns do shoot/kill people...

Not without some help from carbon based life forms.

[Shoobee]

Actually its 6280.18 but it is often rounded to 6280 or 6400. 1 moa is also 1.0427" but it is often rounded to 1". With all this rounding off, you can get a errors in caculations, or two different schools teaching different numbers.

So the Army, and the Navy, and the Marine Corps lied to me? Again??

[Shoobee]

If you have an Android phone, the Strelok ballistic calc is a pretty good, free estimation tool. The first time I used it, it was off by about 1.5MOA each time. But I spent a decent amount of time plugging in as many variables as I knew into the settings (elevation, temp, pressure, windspeed, more accurate cartridge info, etc), and it got me right on target at 300 after zeroing at 100. It will tell you in Mil/MOA/clicks how to adjust, as well as showing your reticle (bunches of pre-loaded options from popular scopes, including my NF NP-R1), and what distance relates to each tick mark. Very nice for a free app.

https://market.android.com/details?i...LnN0cmVsb2siXQ..

What if you drop it and it breaks, or lose it, or the battery dies? That's the problem that I have with modern technology.

I call these technology traps. Ergo, if your garage door opener stops working, you are trapped when SHTF.

I am hopelessly old school.

[cfusionpm]

Then I'm screwed! :P I only go shooting at a range or in controlled environments anyway, so I'm OK with that. Civilian hobbyist here.

But I think I will make a small dope card to fold up and keep in my stock pouch just in case!

[Shoobee]

Then I'm screwed! :P I only go shooting at a range or in controlled environments anyway, so I'm OK with that. Civilian hobbyist here.

But I think I will make a small dope card to fold up and keep in my stock pouch just in case!

My older brother will be screwed too then.

He really got into all these new toys as well, GPS, I-phone aps, etc.

I told him that for an old man, older than me, he has become a real techno-geek in his old age. He loves these new toys as much as I hate them.

A "dope card" is a good idea, in case SHTF.

[CSACANNONEER]

My factory, out of the box 700 SPS Tactical shot 1/2MOA just yesterday:

Using American Eagle "7.62 M1A" ammo:

And all I did was watch Magpul's precision rifle DVD a couple times.

Ah, you weren't using the perfect AW though. I bet you didn't even have a laser scope on it. http://www.calguns.net/calgunforum/s...d.php?t=528894

Primer on long range shooting (steps) --

- Do your homework and learn about ballistic coefficients and calibres;

- Choose a calibre (there are only 2 really good choices: the 7mm or the .308);

- Choose a size within that calibre (depends on your favorite game animal);

- Choose a rifle (Remington etc.);

- Choose a scope (Leupold etc.);

- Center the cross-hairs within the scope BEFORE MOUNTING IT;

- Center the scope on the rifle mount (with rings and bases) using a laser boresighter and then after tightening, glue it with locktight or clear fingernail polish;

- Sight-in the rifle at 100 yds (the laser boresighter should put you on paper at least at 100 yds; at shorter than 100 yds the paralax may throw you off);

- Zero the dials on your scope for the 100 yds setting;

- Create a range card for the area (average atmospheric temperature and topographic elevation) of your likely hunting/shooting location;

- Tape/laminate the range card to your rifle stock someplace where you can easily see it;

- Set your scope for 100 yds, or 150 yds, or 200 yds, or 250 yds, or 300 yds depending on your own preference and needs and your expected shot (there are some applications where you could set it for 700 yds, it all depends);

- Practice, practice, practice.

Primer on long range shooting:

Ignore most of the above. Find someone who actually has experience shooting past their backyard fence and ask for advise. Anyone who wastes their time with a laser boresighter and or sights their rifle in at 100 yards or less when they are never planning on shooting that close does not have the enough practical experience to be writing primers on the subject. In the end, practice, practice, practice is the key and the only part of the primer I agree with.

Nothing ever stays constant though.

I have noticed that the gun itself warming up from shooting it is a major variable for what happens downrange.

The atmospheric temperature also changes by the hour.

The atmostpheric pressure changes by the day.

Topographic elevation changes by location, even within a hunting zone, from 5000 ft to 9000 ft or more.

And so forth.

Canyon Country (Utah ???) must be the same as everyplace else on God's Green Earth.

[btw: "consistent" has no ants in it.]

Nothing stays consistent for ever but, getting back to the post I was responding to, I will continue to disagree with the statement that wind plays a major factor past 800 yards. It can play a major factor at any distance but, if it is consistent, it does not hurt precision a bit. In fact, I've seen some .2 and .3 moa groups shot at 1000 yards with consistent 10-15 mile an hour winds. Yes, everything else does play a role as well. But, precision shooting is not done when taking shots for a group at different elevations, during different times of day, at different temps or while the barrel is heating up.

Canyon Country is in California.

When it's rainging here, I have ants everywhere. It is a consistant PITA!

[Shoobee]

Primer on long range shooting ...

Ignore most of the above. Find someone who actually has experience shooting past their backyard fence and ask for advise. Anyone who wastes their time with a laser boresighter and or sights their rifle in at 100 yards or less when they are never planning on shooting that close does not have the enough practical experience to be writing primers on the subject. In the end, practice, practice, practice is the key and the only part of the primer I agree with.


Nothing stays consistent for ever but, getting back to the post I was responding to, I will continue to disagree with the statement that wind plays a major factor past 800 yards. It can play a major factor at any distance but, if it is consistent, it does not hurt precision a bit. In fact, I've seen some .2 and .3 moa groups shot at 1000 yards with consistent 10-15 mile an hour winds. Yes, everything else does play a role as well. But, precision shooting is not done when taking shots for a group at different elevations, during different times of day, at different temps or while the barrel is heating up.

Canyon Country is in California.

When it's rainging here, I have ants everywhere. It is a consistant PITA!

Jeeze CanyonCount.

Advise and advice are two different words.

And forever is one word.

At least we got your consistent fixed now.

I am sure you are a good shot. You don't need to short-dick worry about that though.

[freonr22]

Can you ad vise on how not to offend every poster on this board?

[CSACANNONEER]

Jeeze CanyonCount.

Advise and advice are two different words.

And forever is one word.

At least we got your consistent fixed now.

I am sure you are a good shot. You don't need to short-dick worry about that though.

Yep, Ize shuld learns hows ta uz da speil chekers. Sorrys dat I donuts ed its me posts beefour eyes hits da scend butt in. I don has fat figer an' reelly sloo enter nets soos, I kants bee botherd wit litel dings lik spelin' every ting write. Oh yea, sometimes my keyboard sticks and or misses a letter that Iv've typed. Would you believe that I passed the grad writting requirement test at Cal Poly with an 11 out of 12? OK, I did get an "F" in 7th grade spelling but, I got an "A" before that an a "B" on the next report card.