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Centerfire Rifles - Semiautomatic or Gas Operated Centerfire rifles, carbines and other gas operated rifles.

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  #1  
Old 09-15-2020, 6:54 AM
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Default Best distance to sight in a 9mm sub gun?

I have a Stribog with a red dot.. has around a 9inch barrel.

I've read 10yards and 25 yards. I noticed if I dial it in at 10 it's high at 25.. I imagine if I dial in at 25 it will be low at 10.

So, what says the CG braintrust?

Thoughts
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Old 09-15-2020, 6:59 AM
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How far do you plan to shoot it ?
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Old 09-15-2020, 7:12 AM
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Originally Posted by Mr.Caketown View Post
How far do you plan to shoot it ?
Realistically I would imagine 10 to 50 yards.. with 50 yards being fairly rare

Yea, i get the obvious answer is to sight it in for the distance you shoot, but I was more curious if there was a sweet spot distance that was a good compromise between targets near and far.
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Old 09-15-2020, 7:30 AM
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9mm handgun. What's wrong with a 25 yd zero? Most 9mm handguns are zeroed there.

That would be my starting point anyway.
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Old 09-15-2020, 9:56 AM
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I zero all my my PCCs at 50 yards because that's the range at which I typically shoot them. I shoot them at 50 to 100 yards by preference and for a challenge rather than any real-world objectives. If self-defense were my primary objective, I'd probably zero them for 25 yards, as others suggest.

You can use this calculator to predict the trajectory of a bullet zeroed to various ranges. http://gundata.org/ballistic-calculator/ Just make sure you click "Advanced Options" to set the zero range. Without changing anything for the 9 mm defaults other than setting the zero to 25 yards, I get the following data:

Range Drop
(inches) Velocity Energy Wind drift
(inches) Time
(milliseconds)
0 -1.4853 1249 398 0.0000 1
10 -0.7159 1218 379 0.0000 25
20 -0.1808 1189 361 0.0000 50
30 0.1082 1161 344 0.0000 76
40 0.1394 1136 329 0.0000 102
50 -0.0989 1112 316 0.0000 128
60 -0.6183 1090 303 0.0000 156
70 -1.4302 1070 292 0.0000 183
80 -2.5455 1052 283 0.0000 212
90 -3.9752 1034 273 0.0000 241
100 -5.7299 1018 265 0.0000 270

The drop at 50 yards is surprisingly small! And between 10 and 50 yards the bullet will hit less an inch off point of aim. I'm no expert, but for tactical purposes that seems extremely tolerable. If you run a similar calculation for a 50-yard zero, you'll see that the 10-to-50-yard drop is, for practical purposes, identical.

Of course, you'll want to change the numbers for the type of ammo you'll use and the muzzle velocity you expect out of a 9-inch barrel. As a caveat, I'm not at all an authority on ballistics, so I apologies for any errors I've made.


Quote:
Originally Posted by Steve1968LS2 View Post
I have a Stribog with a red dot.. has around a 9inch barrel.

I've read 10yards and 25 yards. I noticed if I dial it in at 10 it's high at 25.. I imagine if I dial in at 25 it will be low at 10.

So, what says the CG braintrust?

Thoughts

Last edited by DChartier; 09-15-2020 at 10:16 AM..
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Old 09-15-2020, 10:02 AM
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85 yards
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Old 09-15-2020, 4:33 PM
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I use a 15 yd zero and it works good for the 1.93 mount on my 9kt.

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Old 09-15-2020, 5:14 PM
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Always sight in a gun for the distance you plan on shooting it.
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Old 09-15-2020, 6:43 PM
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Quote:
Originally Posted by FeuerFrei View Post
9mm handgun. What's wrong with a 25 yd zero? Most 9mm handguns are zeroed there.

That would be my starting point anyway.
Well.. it's a sub gun.. so a 9inch barrel..

I sorta thought 25 yards.. then I started reading and lots of competition shooters were saying 10 yards... then I read all sorts of distances in between..

So I was curious.
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It's easy to be a keyboard warrior, you would melt like wax in front of me, you wouldn't be able to move your lips.
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  #10  
Old 09-15-2020, 6:45 PM
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Quote:
Originally Posted by DChartier View Post
I zero all my my PCCs at 50 yards because that's the range at which I typically shoot them. I shoot them at 50 to 100 yards by preference and for a challenge rather than any real-world objectives. If self-defense were my primary objective, I'd probably zero them for 25 yards, as others suggest.

You can use this calculator to predict the trajectory of a bullet zeroed to various ranges. http://gundata.org/ballistic-calculator/ Just make sure you click "Advanced Options" to set the zero range. Without changing anything for the 9 mm defaults other than setting the zero to 25 yards, I get the following data:

Range Drop
(inches) Velocity Energy Wind drift
(inches) Time
(milliseconds)
0 -1.4853 1249 398 0.0000 1
10 -0.7159 1218 379 0.0000 25
20 -0.1808 1189 361 0.0000 50
30 0.1082 1161 344 0.0000 76
40 0.1394 1136 329 0.0000 102
50 -0.0989 1112 316 0.0000 128
60 -0.6183 1090 303 0.0000 156
70 -1.4302 1070 292 0.0000 183
80 -2.5455 1052 283 0.0000 212
90 -3.9752 1034 273 0.0000 241
100 -5.7299 1018 265 0.0000 270

The drop at 50 yards is surprisingly small! And between 10 and 50 yards the bullet will hit less an inch off point of aim. I'm no expert, but for tactical purposes that seems extremely tolerable. If you run a similar calculation for a 50-yard zero, you'll see that the 10-to-50-yard drop is, for practical purposes, identical.

Of course, you'll want to change the numbers for the type of ammo you'll use and the muzzle velocity you expect out of a 9-inch barrel. As a caveat, I'm not at all an authority on ballistics, so I apologies for any errors I've made.
Thanks!
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Old 09-15-2020, 6:45 PM
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Edit, check out the pcc section of other forums. Seems like 20, 25, 50 yard zeros are discussed the most

Last edited by naz; 09-15-2020 at 6:49 PM..
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Old 09-15-2020, 7:00 PM
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Personally I had my 9mm carbines (16” barrels) at the 50m line. Ballistics wise there isn’t a lot of difference between 8” and 16” barrels, so I’d still aim for 50 or so if using a red dot.
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Old 09-15-2020, 7:07 PM
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Make a decision about the ‘range’ of distance that you expect to shoot, say 10yd to 50 yd. Whatever works for you. Then go to JBM Ballistics, armed with info on how to use their calculator. You’ll need to know Projectile Type and weight, velocity, height of optic or sight above bore, and maybe even environmental variables, although for a PCC temp, altitude, etc are not going to be much of a factor. Then experiment with various ‘Zero’ distances and settle in the one that gives you the best results for your intended range of targets.
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Old 09-15-2020, 7:14 PM
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Quote:
Originally Posted by Steve1968LS2 View Post
Well.. it's a sub gun.. so a 9inch barrel..

I sorta thought 25 yards.. then I started reading and lots of competition shooters were saying 10 yards... then I read all sorts of distances in between..

So I was curious.
Then it's an SBR?

I thought it was a 9" bbl so I kinda consider that more of a pistol with a brace on it to get around the SBR registration pain in the balls.

I think you can solve the problem with a box of 9's and about a half hour of range time.
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-- Frederick Douglass --

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Old 09-15-2020, 7:31 PM
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Personally I like the farther zero, and accept to be a little bit under, when shooting closer. In any practical sense it won't matter, the maximum off will be your sight's over-bore distance. But it does matter if you shoot matches, if you don't account for it you'll end up with close in targets with small hit areas, and end up with two misses just into the no-shoot area. Simple to overcome with practice. I find it easier to adjust for close targets and be spot-on for farther targets. Instead of the other way around.
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Old 09-15-2020, 7:42 PM
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You NEED to zero at 13.4 yards or else it won't work!



I'd probably do 25 yds as a general starting point if you don't shoot further than 50 regularly
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Old 09-16-2020, 7:16 AM
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Quote:
Originally Posted by FeuerFrei View Post
Then it's an SBR?

I thought it was a 9" bbl so I kinda consider that more of a pistol with a brace on it to get around the SBR registration pain in the balls.

I think you can solve the problem with a box of 9's and about a half hour of range time.
No.. it's a pistol with a brace

It's a Stribog 9mm ... the joys of living in NC .. slow working on SBRing an MP5 and UMP

Thanks, learned some stuff. To be honest I always shot with irons so the overbore was almost nothing. My old eyes now need red dots so I took a bit to get into how the larger overbore really changes the up close impact points when you zero out at 25 or 50 yards.

Thanks again
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