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Last edited by DWood; 07-26-11 at 15:32. Reason: Done
Square shoot and see targets (square just because they have 1" grid lines)
I "sight in" all my rifles and my slug gun at 50 yds.
I use the 100 yard zero also.
Kyle Defoor: The 12 Days of Zero
http://www.kyledefoor.com/2010/12/12-days-of-zero.html
I use a 6" round shoot n see at 100 yards, preferably on a white backer board. Its just big enough to center a 4 moa aimpoint and still see the outer edges of the bull to be sure you're centered up.
I'm also not sure how you could call a 50yd/200m zero flatter shooting than a 100 yard zero. Your zero is low up to 50 yards, where it climbs above the line of sight for certain amount of distance, then drops back below the line of sight at 200m.
The 100-yard zero is just 1/4 to 1/2" low up to 100 yards, where it touches the line of sight and begins to drop again. At approximately 200 yards, depending on ammunition, you are going to be -2.5" low.
Consequently, A guy can hold high in the chest all the way out to 200 yards, and is guranteed to be at most 2.5" low to POA (if they do their part). This is the most bomb proof choice for us, as we don't have to teach different hold overs. Same point of aim, well past where we reasonably expect our students to engage.
Kyle Defoor's link is great, as well as this link to Jeff Chudwin:
http://www.lawofficer.com/article/ma.../long-gun-zero
Last edited by PatrolRifleGroup; 07-26-11 at 15:49. Reason: grammar and link
In your situation, I agree. I'm going to try a 100 yard zero on my SBR with an Aimpoint. My 16" with a 1-4 will stay sighted in at 50 and that is a flatter trajectory out to 200. Since I have proven to myself that this works for me, I will stick with it.
To say that it is a physically impossible to zero a rifle at 50yds is not correct. Of course you can zero a rifle as any range before the bullet hits the ground, and you can certainly zero an AR15 at 50 yards, if a 50yd zero is advisable is another discussion.
As was posted earlier:
While we can't change the trajectory of a round, (unless you have found away to change gravity) we can change the zero. The zero is the distance set by the shooter at which POA/POI are the same. A shooter could zero their rifle at 43yds, or 51yds, or 67yds... the possible zeroes are infinite. Due to trajectory there may be two zeros, the near and the far zeros.Zero
A zero is the elevation and windage settings required
to place a single shot, or the center of a shot group, in a
predesignated location on a target at a specific range,
from a specific firing position, under specific weather
conditions.
The idea that is is physically impossible to have a 50yd zero makes no sense the only thing that would make a 50yd zero with an AR15 impossible would be an optic or sights that lacked sufficient elevation adjustment.
The fact that, due to trajectory, a round zeroed at 50yds will have another POA/POI at a further range doesn't preclude one from zeroing at the closer range.
The problem comes when people think they can "zero" their rifles at close range and that will magically translate to a "zero" at some further distance. I believe you should actually zero your carbine at he range you want for a zero. If you want a 50yd zero, then zero the carbine at 50yds, if you want a 100yd or 200yd zero, while you can get close using closer ranges you must zero at 100 or 200yds.
I prefer a 100yd zero for all my ARs, whether red dot or magnified optic, with a 100yd zero the near and far zeros are effectively the same approx 100 and 110 yds.
Cameron
Last edited by Cameron; 07-26-11 at 16:32.
I'm having a hard time understanding this.
First, the sights or scope is at least 2.4" above the bore so no matter what range you are zeroed, at some point you will be 2.4" low.
If a guy has only a 50 yard range and wants to hit the bulls eye at 50 yards it can be done or zeroed at 50 yards.
If a 100 yard zero is the highest point the bullet will travel then how does it compare to the 200 meter zero that is actually falling? Rising at 50 or falling at 200 makes no difference, only semantics and proves there is no one definition of zero.
Sighting in at 50 yards does require refining the zero at 200, the IBZ is just another form of PBR or point blank range and is all relative to your targets size. A 6" kill zone will have a different PBR than a 2" kill zone. A 100 yard zero is limiting to me and my uses but it does not make it a wrong choice, neither does a 250 yard zero most Western big game hunters use.
Let's not get so technical that we lose our common sense.
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