Mk18 zero range

[a1madrid]

So I zeroed my new Mk18 10.3 inch build yesterday at 25 yards since my indoor range goes to 30. I was wondering what the next zero point on a 25 yard zero shooting 55 grain xm193. I tried to find the 25 zero online for a 10.3 but wasn’t successful and I was just wondering what that zero looks like over distance. Thank you.


Sent from my iPad using Tapatalk

[1168]

What’s your optic height? With Ballistic AE, inputting 2650fps with Litz G7 for a Sierra 55 FMJBT, I get a far zero of 293, 318, 338 for absolute, lower third, and NV, respectively. Using BC data from M193 drops ~5yds from each with the same velocity.

I estimated 2650 based on Eagle_19er from TOS chrono thread. Using 2600fps drops roughly 10yds from far zero.

These sound rather optimistic. Anyone have real DOPE for this one?


So I zeroed my new Mk18 10.3 inch build yesterday at 25 yards since my indoor range goes to 30. I was wondering what the next zero point on a 25 yard zero shooting 55 grain xm193. I tried to find the 25 zero online for a 10.3 but wasn’t successful and I was just wondering what that zero looks like over distance. Thank you.


Sent from my iPad using Tapatalk

[a1madrid]

I’m running an absolute cowitness mount on my red dot


Sent from my iPad using Tapatalk

[1168]

I’m running an absolute cowitness mount on my red dot


Sent from my iPad using Tapatalk

Given that height, I’d believe 275yds enough to make it my starting point for testing. Before I punched anything in earlier, I expected an output of 250, though. It would be sweet to know the actual velocity you have.

[a1madrid]

My second zero point should be at 275 yards?


Sent from my iPad using Tapatalk

[grizzman]

Yes, that is the approximate 2nd zero crossing point.

Knowing the actual velocity will eliminate one variable.


Sent from my iPhone using Tapatalk

[1168]

My second zero point should be at 275 yards?


Sent from my iPad using Tapatalk

Based on what the ballistic calc spat out after I punched numbers and played with a couple variables, yes, your far zero should be 275-290yds. We can get closer if we can find either your exact velocity, or maybe through some other guys that actually shoot m193 from a Mk18 (why do you, btw?) at medium ranges. You’ll of course have to shoot it yourself if you must be sure.

[a1madrid]

Based on what the ballistic calc spat out after I punched numbers and played with a couple variables, yes, your far zero should be 275-290yds. We can get closer if we can find either your exact velocity, or maybe through some other guys that actually shoot m193 from a Mk18 (why do you, btw?) at medium ranges. You’ll of course have to shoot it yourself if you must be sure.

Alright based off of that information do you think that a 25 yard zero is a good set up for a gun like that that will be used mostly for just up close?


Sent from my iPad using Tapatalk

[1168]

Alright based off of that information do you think that a 25 yard zero is a good set up for a gun like that that will be used mostly for just up close?

Sent from my iPad using Tapatalk

Define “up close”. A 50 yd zero will keep point of impact closer to point of aim for further. But, out to 100, it probably doesn’t matter, given 12” targets. You can hit smaller targets, you’d just have to hold low. That would be much less concern with a 50yd zero.
65696

[a1madrid]

Define “up close”. A 50 yd zero will keep point of impact closer to point of aim for further. But, out to 100, it probably doesn’t matter, given 12” targets. You can hit smaller targets, you’d just have to hold low. That would be much less concern with a 50yd zero.
65696

Is that chart for a 25 yard zero? Thank you


Sent from my iPad using Tapatalk

[1168]

Is that chart for a 25 yard zero? Thank you


Sent from my iPad using Tapatalk

It is. You’re welcome.

[ST911]

I would zero a Mk18/SBR for 50, rather than 25. 100yd would be okay too. Too much going on with a 25.

25yd zeros are for SMGs/PCCs and pistols with RDSs.

[Korgs130]

I would zero a Mk18/SBR for 50, rather than 25. 100yd would be okay too. Too much going on with a 25.

25yd zeros are for SMGs/PCCs and pistols with RDSs.

I agree. My preference is a 50 / 200 yard zero with an emphasis on the 200 for my 5.56 AR 11.5 SBR & 10.3 pistol. I see no benefit to a 25 yard zero on the OPs gun.

[Wake27]

I would zero a Mk18/SBR for 50, rather than 25. 100yd would be okay too. Too much going on with a 25.

25yd zeros are for SMGs/PCCs and pistols with RDSs.

Also recommend 50.


Sent from my iPhone using Tapatalk

[1168]

5065697

[1168]

10065698

[utahjeepr]

50, but with 77gr smk imi. If your gonna run short shoot heavy.

[Failure2Stop]

Alright based off of that information do you think that a 25 yard zero is a good set up for a gun like that that will be used mostly for just up close?


Optimal zero distances for 10.3" or longer barrel 5.56 are 50, 100, or 200 yards/meters with point of aim coinciding with point of impact (POA=POI).
You can get away with zeroing with POI 1.5" or so below POA at 25 to get in the area needed for being closer when moving back to 50/100/200, but it's always best practice to confirm at longer range if you actually want to have the ability to precisely place shots at those distances.
The 100 yard zero is actually better for close range as it has a more consistent point of aim for acceptable shot placement due to the more gentle ballistic rise to line of sight.

For more detail see: https://www.m4carbine.net/showthread.php?107572-Zen-of-the-100-Meter-Zero

[1168]

Jack’s link posted above is a very good one to read. It is the same zeroing philosophy I was taught in the team leader’s course, for the same reasons.

Using the same range of data I played with earlier, with a 100yd zero you should be hitting ~1.35” low at 25. A 50yd zero should be ~1.08” low at 25.

As said before, you have to shoot it to confirm.

[motor51]

If you search around there was a company that provided targets for different optics and zero ranges. For example, they would have a 25yrd zero point that you would aim at and a separate zero spot for where your rounds should hit. I’ll look for them and post here. I tried them with a rifle I had already zeroed and it worked pretty well.


Here you go. Due to your ranges limited yardage it might help until you can get to a 50yrd range.

http://www.arma-dynamics.com/red-dot-zero-targets.html

Sent from my iPhone using Tapatalk Pro

[turnburglar]

It's hilarious to me how everyone thinks "25 yard" zero won't work. It will absolutely work provided you understand the ballistics you are getting. A 25 yard zero is proxy for a 300 yard zero. I even ran the ballistics for 2650 FPS 55 gr and its still true. Really the only distance the trajectory looked "high" was 7" at 200 yards. That means if you held low on the 6" plate you would still get solid hits.

The area I think most people get lost in the weeds with zero's is that they don't understand when "good enough" is. For example if you are using a 2 moa RDS; that dot is covering 4 inches of the target at 200 yards, and 6 inches of the target at 300. That means the bullet can actually fall or rise a good couple inches in flight and still appear to be POA/POI from the shooter's perspective. Keep in mind we are talking about RED DOTS here. Not optics running 25x-32x magnification.

I prefer to zero my optics at 200; but I have used every other zero under the sun, and just adjusted my holds accordingly. If I only had a 25 yard range to zero on; thats exactly the zero I would use. In fact I would rather have a perfect zero at 25 than a proxy zero for any other range. In fact I hastily zero'd an optic to shoot a long range precision match 2 weeks ago. I literally used a dirt berm than I knew was 200 yards away, and just adjusted turrets until I felt like I was getting POA/POI. I went and shot the match and scored 29/44. A great day for me is like 33-34 hits. I went and actually checked my zero off paper and was 2.5 MOA left. Certainly not a "solid" zero by anyones definition and I was still able to get a fair amount of hits on some really small and far away targets.

[ViniVidivici]

Nobody said the 25 yard zero "doesn't work", just most of us have evolved a preferrence for other.

OP, I'm firmly in the 50 yard zero camp, even for a shorty. Best of all worlds.

[turnburglar]

But the OP said in his original post that his local indoor range only goes to 30 yards. Hence; a 25 yard zero is all he can really get.

[1168]

But the OP said in his original post that his local indoor range only goes to 30 yards. Hence; a 25 yard zero is all he can really get.

He actually never stated that he doesn’t have access to longer ranges, while starting a topic asking about shooting further than 25. But, yes, it will work, which no one has denied.

[a1madrid]

Thank you all for the replies. I’d probably prefer a 100 or 50 yard zero but all I had access to was a 30 yard range that day. I’ll take it out to the desert to confirm or adjust zeroes at some point.


Sent from my iPhone using Tapatalk

[Sparky5019]

Depends on your application…

I use a 36y zero for all my SBRs (10.3s and 11.5s). Seems to do better for CQB type distances. If you’re cloning that’s a different deal.