MOA question about 22 lr

Don P said:
IIRC at the Appleseed shoot they stated that If you are MOA at 25 yards you will be on at 200 yards and for all this MOA stuff isn't that what scope adjustment is all about. Doesn't a sniper use the dots in the scope to compensate at distance. I don't see how a shot can be on at 50, 100, 200, 300 yards without changing something
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That 25 yard concept is for flat shooting center fire rifles, not 22 rimfire. I don't like the 25 yard rule because it's much too close to show errors that would be significant at farther distances.

You're right though, you can't be "on" at ranges from 0-300. Hunters generally use a "close enough" rule. For example, my .204 is sighted around 1" high at 100. That puts me around 1.5" at 150, zero around 250 and 1.5" low at 295. (Close estimates, I don't recall the exact numbers now) Since I'm shooting woodchucks with an approximate 4" kill region, I'm "on" throughout that entire range.

Target shooters, and often hunters, will use scope adjustments. That's why it helps to understand MOA and it's effect over distance. A "click" on a scope is usually 1/4 or 1/8 MOA at 100 yards. (They often specify inches rather than MOA but that's just so people understand.) So, if you know your bullet is 4" low at 400 yards, and your scope is 1/4 at 100 per click, that makes it 1 per click at 400, so 4 clicks up puts you dead on.
 
It's measurement of angular dispersion in minutes of angle .This just happens to be almost 1" at 100 yds [ 1 MOA]! Convenient !
Its sometimes difficult to extrapolate .There are cases where a rifle may group 1" at 100 yds but only 1.5" at 200 yds !! You may see this with cartridges like 6.5x55 or 7x57.
Standard measurement for cf rifles is 100 yds ,handguns 25yds.
 
A Minute Of Angle is a unit of geometric measure. Whether you are shooting a 50 cal Ma2, an 88mm cannon, a crossbow or a slingshot. It is: 0.2617" @ 25yds, 0.5235" @ 50 yds, 1.047" @ 100yds, 2.094" @ 200yds etc etc.
It is a useful means of comparing the accuracy of any firearm.
Also used for the same purpose is Radians or milliradians, as in Mildot scoper.
1 milliradian is 3.6" @ 100 yds, 1/10 milliradian is 0.36" @ 100 yds. Same purpose, different measurement units. All lead to the same thing, a convenient means of comparing OR setting up to adjust any sighting system. Ya just gotta know what your sight system is calibrated in.

My only confusion comes when I switch rifle between ones calibrated in Milliradians and ones calibrated in MOA.

Roger
 
Wholly Crap!!! And all these years, i worked from the premis that bullets go in this end and go out that end.... If I don't hit the target, change point of aim and shoot it again.

I got a headache....... ;) Time for a single malt and a long filler to ponder my next shot......

Shoes
 
would say you have to shoot. I believe any or all claims to being "one MOA" are generally associated with 100 yard shots.
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Bolderdash, one MOA is one MOA at no matter what range 50, 100, 200, 500, 1,000 yards. It stands for "minute of angle" actually 1.1 inches at 100 yards, 0.55 inches at 50 yards, 2.2 inches at 200 yards, 3.3 inches at 300 yards, etc,etc....... All of these are one minute of angle or 1 MOA.

Jim
 
Bolderdash, one MOA is one MOA at no matter what range 50, 100, 200, 500, 1,000 yards. It stands for "minute of angle" actually 1.1 inches at 100 yards, 0.55 inches at 50 yards, 2.2 inches at 200 yards, 3.3 inches at 300 yards, etc,etc....... All of these are one minute of angle or 1 MOA.

Jim
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And it defines the nautical mile. 21,600 minutes in a full circle and 21,600 nautical miles around the equator of the earth, not a coincidence.

Just some extra trivia for the discussion.
 
Jim243 said:
It stands for "minute of angle" actually 1.1 inches at 100 yards, 0.55 inches at 50 yards, 2.2 inches at 200 yards, 3.3 inches at 300 yards, etc,etc....... All of these are one minute of angle or 1 MOA.
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1 MOA at 100 yards is 1.0472 inches.;)

.5236 at 50 yards, 2.0944 at 200, 3.1416 at 300... 10.472 at 1000.
 
Just a reminder, when you measure groups you should measure bullet holes center to center. Most will find the two bullet holes most widely separated in the group, measure the longest possible distance from the edge of one to the edge of the other, and subtract one bullet diameter. As a kid learning my way around my first .30-06, I was pleased that my groups were a bit less than one inch edge to edge. When I bragged to the range officer and showed him a target, he corrected me and, of course, I was even more pleased.
 
Its sometimes difficult to extrapolate .There are cases where a rifle may group 1" at 100 yds but only 1.5" at 200 yds !! You may see this with cartridges like 6.5x55 or 7x57.
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If a rifle is capable of sub MOA at any distance it is capable at any distance. If it can't it is the ammo, scope, wind or the shooter, not the rifle. Ammo is least likely the cause of a loss of MOA accuracy unless you change components.

A scope without parallax adjustment is most likely only going to give its best group at the distance it is calibrated to ie 100 or 200 yards. Probably what is happening with 1" at 100 and 1.5 at 200.

Gusts of wind will blow a group from 1" to 3" if the shooter is not paying attention. And the farther out we shoot the worse it gets.

And of course the talented ability of the shooter or lack thereof!
 
If a rifle is capable of sub MOA at any distance it is capable at any distance.
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I will agree somewhat. I think the rifle is limited to the effective range of its caliber. For example - a .223 rifle that can shoot sub moa up to 600 yards (this is just an example, I'm not even sure if a .223 rifle exist capable of such feat) sooner or later that caliber rifle will be limited by its capabilities.
 
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