Is there a graphic of 14.5" barrel zero/traj for 50yd zero for various cartridges 9M193, M885, 75 gr Hornady, ect)?
thank you
I might be able to work up something with Strelok+. Is there a particular optic and mount height you’re interested in? It’ll all be approximate, and based around data I have on hand for KS in 110 degree heat with 70% humidity.
[QUOTE=Leonidas24;2977692]I might be able to work up something with Strelok+. Is there a particular optic and mount height you’re interested in? It’ll all be approximate, and based around data I have on hand for KS in 110 degree heat with 70% humidity.:p[/QUOT
Yes please…for a 14.5 " barrel M4, carry handle sight . I will zero at 50 yds, and never shoot over 200 yds.
Leonidas’ data will probably indicate a 50 yard zero is suboptimal if 200 is your maximum range.
EDIT - I drew this false conclusion after running the numbers in a ballistic calculator assuming a 1.5" sight height, incorrect for an AR.
Andy
FYI the 50/200 yd zero is bulls*** for any real duty/defensive cartridges. Once you plug in the actual data like real BCs from Bryan Litz and realistic velocities out of 14.5"s or shorter barrels you’ll find things are closer to 50/125 or 50/150.
I don’t have a 14.5” barrel, but it makes sense that the far zero would be closer than 200 yards.
perhaps this may help.
https://www.m4carbine.net/showthread.php?171434-AR-15-Zero-Graphics-Various-barrel-lengths-and-zero-ranges-M193-M855-and-Mk262/page6
Iron sights, 193, 855… What difference does the zero make if it shoots within a couple of inches of where you aim between 50 and 200 yards? What am I missing here? No way you can squeeze a pigs ear hard enough to get a silk purse.
There are lots of free external ballistics calculators, but none of them will be exact since you haven’t provided actual velocities with all the different ammo options.
……so what’s the point?
You guys are funny…
Here’s the math.
Strelok Pro:
16" AR
2850 FPS
62gr FMJ at 0.271 G1
50 yard zero
100 +1.3"
150 +1.2"
200 -0.4"
250 -3.8"
300 -9.1"
350 -16.7"
400 -26.8"
450 -39.9"
500 -56.6"
To the OP:
If you are shooting with iron sights, zero at 50 and your dead on at 200. With iron’s anyways you would never be able to tell if the bullet was 6" high or low much less 1/2".
What optic height are you plugging in?
1.9" for RDS
1.7" for LPVO
I’ve been adding an inch for the height of the rail over the bore. So, 2.9” for Scalarworks/T2. Seems to work well. I don’t know of any loads that are as far off as you’re reporting in a 12.5”-14.5”, or even an 11.5”. Furthest off I could come up with (on the calculator) was 170yds for a slow load from an 11.5”. For my 12.3”, 50/200 is spot on for 68-70gr loads, and m855 crosses around 220.
thank you
thank you…I will have to see…I’ll just zero at 50 and see when they print at 200 when the range opens (it’s closed due to safe concerns as bullets were landing outside of the berms)…
I was certain this was true and ran the numbers in a ballistic calculator to confirm. I came up with a different trajectory because I left the sight height correct for a bolt action rifle. It was a good reminder to me that the ammo manufacturers’ advertised trajectories are plotted for a much lower sight height than an AR has.
Andy
…A graph for a 14.5" barrel M4 showing the trajectory with a 50 yd zero with a 100 yd zero for M193 to see the difference would be great…if one has a graph to share…
Why isn’t “everyone” running 2.5” above the bore?
Sent from my iPhone using Tapatalk
From Ballistic AE
3025fps
0 -2.5
25 -1.1
50 zero
75 0.9
100 1.4
125 1.7
150 1.6
175 1.2
200 .3
0 -2.5
25 -1.5
50 -.7
75 -.2
100 zero
125 -.1
150 -.5
175 -1.3
200 -2.5
Tall mounts. I use 2.9” over bore in the calculator for ~1.9” mounts.
…THANK YOU …