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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/18/2006 at 20:42
ultramag View Drop Down
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 im new to the shooting sport, very new. i purchased a remington 700 7mm ultra mag. looking at the ballistics chart i got from the remington web site, i seemed to be confused. they claim 250 yds is zero for that calliber, what does zero mean?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/18/2006 at 23:50
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The zero at 250 yards means you will sight the rifle in at that distance and thats where its going to hit.  You could sight it in at 100 and that would be the zero or 200 and so on.  Zero just means you are not aiming high or low but right on.  
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/19/2006 at 08:09
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The bullet is propeled by the expantion of gases from the burning powder. After it is propeled then it has to act against the forces of nature. The two main ones are gravity and wind resitance. The minors being things like wind, rain and dust. 

 

 The bullet flies in an arc. Think of a rainbow that has varying degrees of "flatness".  If your barrel is one point, the point of origin.  Where you want the bullet to impact without deviation is the zero.  

 

By controling the size of the arc then we control the zero point. Normally while hunting we pick a range where in the arc is limited in size for the nearer part of the bullets flight. Say no more that 3 inches higher than the zero.  So, with only a minor amount of deviation your rifle would "zero" at 250 yards.  I say this because you can "Zero" your rifle at any range you wish, but it comes at the price of an arc that could be very user unfriendly.  If I were to set my .308 at 37 inches high at 300 yards then it would be zeroed at 600 yards. Now, should a coyote be in the front yard that zero could be a problem. 

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/19/2006 at 09:37
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Well stated silver.

 

I like a 100yd zero for my bolt gun and 50yd zero for an AR.

I rarely shoot my bolt gun more than 500yds either. 

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/19/2006 at 10:21
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If your interested there is a new Ballistic Catalog on the Federal Premium site.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/19/2006 at 13:17
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Ammunitions manufactureres love to set their zeros way out there, to give the impression that "is one flat shootin' caliber". If you're interested in such things Sierra has a Ballistic PC program, as well as Ohler chrongraph. There also non product affiliated products. 7mm RUM eh? I hope you get it sighted in before the throat erosion takes over, nothing personal. (another thing the manu. doesn't talk about).
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/19/2006 at 13:44
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 thanks for all the replies fellas, i got the answer i was looking for.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/20/2006 at 08:54
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Originally posted by silver silver wrote:

 

 

The bullet is propeled by the expantion of gases from the burning powder. After it is propeled then it has to act against the forces of nature. The two main ones are gravity and wind resitance. The minors being things like wind, rain and dust. 

 

 The bullet flies in an arc. Think of a rainbow that has varying degrees of "flatness".  If your barrel is one point, the point of origin.  Where you want the bullet to impact without deviation is the zero.  

 

By controling the size of the arc then we control the zero point. Normally while hunting we pick a range where in the arc is limited in size for the nearer part of the bullets flight. Say no more that 3 inches higher than the zero.  So, with only a minor amount of deviation your rifle would "zero" at 250 yards.  I say this because you can "Zero" your rifle at any range you wish, but it comes at the price of an arc that could be very user unfriendly.  If I were to set my .308 at 37 inches high at 300 yards then it would be zeroed at 600 yards. Now, should a coyote be in the front yard that zero could be a problem. 

 

I think someone stayed at a Holiday Inn Express last night.!

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/20/2006 at 08:55
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Just kidding silver, you gave him an excellent example.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/22/2006 at 13:04
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I never shoot over about 200 yds.  I sight everything about 1" high at 100.
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