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Sage
01-28-12, 21:09
This has been eating at me, so I'm going to put it before you guys.
I was told this the other day, that sighting in a .223 AR-15 at 25 yards with open sights can get you on target for 300 yards.
Now I've been shooting .223's since Vietnam, but I've never heard of that. I've sighted in with a Scope at 25 yards for getting on paper at 100 yards, then tweaking it up on the bull. It's fairly easy for me to get on at 200 yards, but 300 yards will seperate the amatures from the pros. What do you all say?
Keydet08
01-28-12, 22:29
On my ballistic calculator an M16A2 zeroed at 25yds will be 8.4 inches high at 300yds so you would certainly be on paper. The initial intersection for 300yds is 36yds so if a 300yd zero is what you desire shoot poi/poa at 36 then move to 300.
Sage
01-28-12, 22:44
On my ballistic calculator an M16A2 zeroed at 25yds will be 8.4 inches high at 300yds so you would certainly be on paper. The initial intersection for 300yds is 36yds so if a 300yd zero is what you desire shoot poi/poa at 36 then move to 300.

Thank you Keydet08:
I'm glad I didn't say anything argumentive to him then. I'll put this in my notes, and give it a whirl. I don't think I can do it with the apeture sights, but I will try. :big_boss:
a0cake
01-28-12, 22:53
http://m4carbine.net/showthread.php?t=65679

https://www.m4carbine.net/showthread.php?t=97885

Read these for a good start.
Sage
01-28-12, 23:30
http://m4carbine.net/showthread.php?t=65679

https://www.m4carbine.net/showthread.php?t=97885

Read these for a good start.

Thanks a0cake: That's some good reading. I used the 50/200 yard scheme to sight in my rifle, but I didn't know about all those other schemes. So, what the young man should have said was 25meters would connect at 300 yards POA. So he may have known what he was talking about.
Buck1122
02-26-12, 20:15
I would stongly suggest just going to JBM Ballistics and use their ballistics calculator. If you don't have a portable weather/altimeter I would just watch the weather channel and write down the temp and barometric pressure and humidity.

The, just plug in your load, range, etc. and you will have a pretty accurate idea of your dope on the shots from 25 to 300 pretty quick.

Their is also a chart on here that is reference above that gives great graphs on the .223 at different ranges which may help. Lots of choices....just pick the zero which you will be shooting close to most of the time and you will be making less adjustment. No need for Kentucky windage type shots at 300....they have pretty much ever .223 load coming out of an AR mapped out really well.

Good luck and happy shooting.
shootist~
02-26-12, 23:15
The pressure reported on the news is adjusted to sea level. You need the actual station pressure at your altitude for JMB or other ballistics software.
Sage
02-27-12, 06:45
The pressure reported on the news is adjusted to sea level. You need the actual station pressure at your altitude for JMB or other ballistics software.

:big_boss:
Buck1122
02-27-12, 15:59
Good point shootist.....