Anyone have info on the 265 yard zero for the AR?
seems like someone posted something about it years ago, then at the WPW match today some guys were using it and doing well. Winston P. Wilson in Little Rock. Thanks in advance. btw, I am doing horribly ....lol.
Odd number you have there
It sure is. I had heard about it before here but just saw it used very well in a match. But I agree, what an oddball number - apparently it gives point blank zero.
About six clicks up if you have 1/2 minute elevation. What's the point of point blank zero??
What exactly is a point blank zero?
B
Hey Garandpa....someone else called this a point blank zero. I am not sure what the full meaning of this is, although I know what point blank is. Some of the competitors in my last shooting competition used it with ACOGS and irons and did very well. their success has me curious...can you provide any info?
Originally Posted By FordGuy:
Hey Garandpa....someone else called this a point blank zero. I am not sure what the full meaning of this is, although I know what point blank is. Some of the competitors in my last shooting competition used it with ACOGS and irons and did very well. their success has me curious...can you provide any info?
Well. . . .
Say you are shooting at an 8 inch diameter target. Some people like to zero so their projectiles trajectory will not go above 4 inches above line of sight, then consider max point blank range to be when the bullet has dropped 4 inches.
I never heard of 265 yards zero. A 265 yard zero ends up being about a 249 meter zero, that is very close to the 225 or 255 meter zeros some people have experimented with. It is also the concept behind the 50/200 zero. Going out a little longer distance then the 50/200 can be flatter, but often harder to find a range that will allow you to get that zero.
Now this isn't some new concept. Hunters often use whats known as a "hunters zero" Find the size of the kill zone on your prey, and get the zero that lets you hold on the center of the heart lung area out to the maximum distance your cartridge allows. The M16A1 used something similar with its rear sight configuration. I forget exactly but when properly zeroed you ended up with a 225 meter zero with one of the apertures. Giving you a rather flat trajectory on your projectile.
I can't shed any light on the "265 yard zero". However, I compete in a known distance course of fire, where targets are engaged at 200, 300 and 600 yards. I have my front sight post set so that when my rear sight is all the way down, I am two inches high at 100 yards. When I go to the 200 yard line, I put on 5 clicks up, the 300 I put on 8 more clicks up and for 600 I put on 15 more clicks up. It puts me in the black at each range, and I use my two sighters to fine tune from there.
Now, having said all of that, it wouldn't surprise me to find that at point blank, I'm a hair low, since my sights are adjusted to be approximately 2 MOA high at 100. Come back 50 and I would be 1 MOA, and at zero I'd be right on the money. It wouldn't surprise me to find that if I had my mechanical zero set to 265 yards, then I'd still be high at 100 and just a hair high at zero.
Garandpa, thanks. I assume you are talking abouti P 100. I shot it a couple years ago, and found it is not the first match you want to shoot..haha.
Since you say you come up 5 clicks (I assume you have the stock half minute wheel) have you checked out the RIBZ post by Molon, where he gets at least 4 additional minutes downward by loosening the set screw in the sight and rotating the bottom drum downward? This might actually give you a mechanical 200 yard zero if you could go 2.5 MOA (5 clicks) instead of 2 (the 4 clicks Molon talks about)
Wonder what you think about that.
My next sight modification will be to let WOA install pins and make it 1/4 minute. I'm beginning to shoot well enough to make it worthwhile. I've had some strings where I would be on one side of the ten ring or the other (with some 9's), but could not adjust to center it up.
I was referring to NRA Regionals, but I did shoot the P100 this year and was 440th out of 1270. Not bad considering I blew my offhand pretty badly (84). Fortunately, I got the wind call right for the sitting at 300 (97), and hung in there at 600 (93). My goal for 2011 is to make the 100.
Roy
The concept of PBZ is that you have a single sight setting which is optimized so as to allow the greatest range of firing distances at which the bullet will strike no more than two inches low or two inches high.
In the case of a 55-grain bullet launched at 3100 fps, you will meet that standard out to 265 yards.
If the rifle is zeroed to be dead-on at 200, the bullet drops that remaining two inches in the next 65 yards.
More simply stated, the PBZ of M193 ammo about 265 yards.
Beyond 265 yards, you'll need to make sight adjustments, or use hold-overs if you want to hit within 2 inches of your target.
Its an interesting subject, but I'm not sure what it has to do with National Match competitions.
