AR 223 scope sight in Question??
OK, I got a few places I can shoot. The easy place to get to only has about 60 to 70 feet of distance from where I shoot to the cardboard box target. This is a great 22 LR plinking range but rarely have I shot a center fire rifle at this little range. Tomorrow I want to sight in a couple of 223s at this little range. I should add, by sighting in, I mean getting on the paper so when I go to where I have a 100 yard place to shoot I'm within no more than 4 inches of where I want to be.
So my question is, if shooting at 50/60 feet where to I want the bullet to strike, how much above or below my 50/60 foot bulls eye in order to have my bullet striking about two inches above my bulls eye at 100 yards??
I figure once I'm on the paper my son and I can easily and quickly finish getting our ARs sighted in on Sunday at our 100 yard range. Then we can get down to the serious business of burning some ammo!![:p]
So my question is, if shooting at 50/60 feet where to I want the bullet to strike, how much above or below my 50/60 foot bulls eye in order to have my bullet striking about two inches above my bulls eye at 100 yards??
I figure once I'm on the paper my son and I can easily and quickly finish getting our ARs sighted in on Sunday at our 100 yard range. Then we can get down to the serious business of burning some ammo!![:p]
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The old advice used to be to sight your .30/06, .270, etc. at 25 yds dead on and that would get you close to where you'd want to be at 100. That was with a scope mounted 1 1/2" c/c above the rifle bore. Your AR scope is probably higher than that but you'd probably be close enough if you'd sight dead on or a little low at your short range. 0 -
According to Federal Fusion ballistics tables, with their 62 grain ammo you want to be .85 inches LOW at 20 yards to be on at 100 yards.
That's assuming the scope is 1.5" above the bore axis.0 -
At those distances, and according to my calculations, you will want your point of impact when aiming at the center of the bullseye, about 2 inches below the point of aim. The center to center height of your sight will be 2.5-2.75 inches, in order for you to get a good cheek weld on the stock.
Best0 -
I got certified at our gun club's 300 yd range for the .223, well the heavier bullets (.69 & 75 grain) drop farther than the .55 grain. The .55 grain ammo is in abundance if that's the ammo you'll burn up, and that is a flat shooting bullet. Therefore you'll have to sight in at 2.5" above at 70' to be 2" up at 100 yards.
I was taught to have my scope zero'd at 100 yards and mark the zero point on the dials, and than make adjustments for longer ranges according to bullet weight and yardage.
good luck, Thor0 -
Go to http://www.jbmballistics.com/cgi-bin/jbmtraj-5.1.cgi and input your information.
That will get you very close.
Added: According to my inputs....55gr bullet at 3150 fps and the scope 2.5 inches above the bore....you should be about 1.5 inches low at 25 yards to get a 100 yard zero.0
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