Author Topic: 10.5 in vs 16 in AR (556) shooting distance  (Read 1508 times)

0 Members and 1 Guest are viewing this topic.

Offline AKM-47

  • Brass Hoarder
  • ****
  • Posts: 1351
    • View Profile
10.5 in vs 16 in AR (556) shooting distance
« on: June 10, 2019, 08:32:06 PM »
A friend asked me what would the (distance) difference be between a AR with a 10.5in vs 16in barrel

I have no idea so I'm asking you





Offline SC-Texas

  • Supporting Member
  • 3 Yard Shooter
  • *
  • Posts: 383
    • View Profile
    • http://Www.TexasGunTrust.com
Re: 10.5 in vs 16 in AR (556) shooting distance
« Reply #1 on: June 10, 2019, 08:48:38 PM »
Are you talking about the fragmentation distance of a military spec FMJ projectile?

Sent from my SM-N920V using Tapatalk


Offline AKM-47

  • Brass Hoarder
  • ****
  • Posts: 1351
    • View Profile
Re: 10.5 in vs 16 in AR (556) shooting distance
« Reply #2 on: June 10, 2019, 09:12:28 PM »
Sense most 556 is military (NATO) … I guess so

Let me text him and see what the question is


Offline Shipwreck

  • Administrator
  • Deplorable Killjoy
  • ********
  • Posts: 28442
  • 1-24-17 was LEGENDARY
    • View Profile
    • Texas Gun Forum
Re: 10.5 in vs 16 in AR (556) shooting distance
« Reply #3 on: June 10, 2019, 09:19:48 PM »
Without a long enough barrel, the round often does not get enough velocity to work like it is designed to do. That can be an issue with short barreled ARs.

Research needs to be done to decide what round to use, as many will not work like they are intended - for defensive purposes

Offline ArmedTexan

  • Single Stage Reloader
  • ****
  • Posts: 1094
    • View Profile
Re: 10.5 in vs 16 in AR (556) shooting distance
« Reply #4 on: June 10, 2019, 09:26:37 PM »
It will probably be different
"The laws that forbid the carrying of arms are laws of such a nature. They disarm only those who are neither inclined nor determined to commit crimes.... Such laws make things worse for the assaulted and better for the assailants; they serve rather to encourage than to prevent homicides, for an unarmed man may be attacked with greater confidence than an armed man."
- Thomas Jefferson, Commonplace Book (quoting Cesare Beccaria), 1774-1776

Offline Axxe55

  • Concealed Carry Pro
  • ****
  • Posts: 2179
  • Trophy Husband! Just ask my wife!
    • View Profile
Re: 10.5 in vs 16 in AR (556) shooting distance
« Reply #5 on: June 10, 2019, 09:47:10 PM »
There are some differences between barrel lengths for sure. As Ship mentioned, velocity being degraded is a huge one.

I found this for your reading and it might be of some use to understand the differences of various barrel lengths and how they affect bullet performance.

https://www.recoilweb.com/sbr-ammo-buyers-guide-141394.html

https://www.rifleshootermag.com/editorial/hornady-sbr-ammo/83751

https://shortbarrelshepherd.com/223-velocity-experiment-from-guns-ammo/

https://files.osgnetworks.tv/2/files/2017/10/velocity-table.gif

 
Misguided Miscreant!
North of Hell, and South of Heaven. Texas, by God!
"It is far better to die on your feet, than to live on your knees."
Remember the Alamo.
NRA Member. TSRA Member.
"I have one nerve left, and it seems there is that one idiot that feels the need to get on it."
"Go ahead, make my day." Dirty Harry. (Carries a 44 Magnum. Nuf said.)

Offline AKM-47

  • Brass Hoarder
  • ****
  • Posts: 1351
    • View Profile
Re: 10.5 in vs 16 in AR (556) shooting distance
« Reply #6 on: June 10, 2019, 09:49:25 PM »
Ok ... here's the bottom line

He wants a AR pistol instead of a rifle (for SHTF) and wants to know how much distance is being sacrificed for a short and light AR in 556

Offline Axxe55

  • Concealed Carry Pro
  • ****
  • Posts: 2179
  • Trophy Husband! Just ask my wife!
    • View Profile
Re: 10.5 in vs 16 in AR (556) shooting distance
« Reply #7 on: June 10, 2019, 10:16:04 PM »
Accuracy or bullet expansion?
Misguided Miscreant!
North of Hell, and South of Heaven. Texas, by God!
"It is far better to die on your feet, than to live on your knees."
Remember the Alamo.
NRA Member. TSRA Member.
"I have one nerve left, and it seems there is that one idiot that feels the need to get on it."
"Go ahead, make my day." Dirty Harry. (Carries a 44 Magnum. Nuf said.)

Offline AKM-47

  • Brass Hoarder
  • ****
  • Posts: 1351
    • View Profile
Re: 10.5 in vs 16 in AR (556) shooting distance
« Reply #8 on: June 10, 2019, 10:38:27 PM »
Accuracy or bullet expansion?

Accuracy

Offline AKM-47

  • Brass Hoarder
  • ****
  • Posts: 1351
    • View Profile
Re: 10.5 in vs 16 in AR (556) shooting distance
« Reply #9 on: June 10, 2019, 10:51:47 PM »
This is one of the reasons why he wants a AR pistol over a rifle



Offline Axxe55

  • Concealed Carry Pro
  • ****
  • Posts: 2179
  • Trophy Husband! Just ask my wife!
    • View Profile
Re: 10.5 in vs 16 in AR (556) shooting distance
« Reply #10 on: June 10, 2019, 10:56:36 PM »
Accuracy or bullet expansion?

Accuracy

Not for sure how much, but accuracy is dependent upon velocity to some extent, not entirely, and going from 16" to 10.5 " there is definitely a loss on velocity. Now how much that is going to affect the accuracy, I don't have a clue, and it could be dependent upon ammo and bullet weight making the difference. Also, with the lower velocity, there will be also more drop at longer distances with the shorter barrel, but it may still be just as accurate as longer barreled AR.

Personally, I would recommend he buy quite a few different brands of ammo in various different bullet weights, and test to see which gives him the best accuracy with his rifle. Testing, testing, testing!  :wave1:
Misguided Miscreant!
North of Hell, and South of Heaven. Texas, by God!
"It is far better to die on your feet, than to live on your knees."
Remember the Alamo.
NRA Member. TSRA Member.
"I have one nerve left, and it seems there is that one idiot that feels the need to get on it."
"Go ahead, make my day." Dirty Harry. (Carries a 44 Magnum. Nuf said.)

Offline Shipwreck

  • Administrator
  • Deplorable Killjoy
  • ********
  • Posts: 28442
  • 1-24-17 was LEGENDARY
    • View Profile
    • Texas Gun Forum
Re: 10.5 in vs 16 in AR (556) shooting distance
« Reply #11 on: June 11, 2019, 08:48:50 AM »
Accuracy at closer distances will probably not suffer, but it will at longer distances. I have seen threads for years and years about why 10" ARs make poor self defense weapons from a ballistic point of view - because of the slower velocity from the shorter barrel.

I read them occasionally, but it is not something I am that interested in.

I do know that many recommend an AR in a different caliber if you are going to go with a short barreled AR. Also, I think I remember it is MORE of an issue if you go with even shorter barrels than 10 inches (and 5.56)

Offline Shipwreck

  • Administrator
  • Deplorable Killjoy
  • ********
  • Posts: 28442
  • 1-24-17 was LEGENDARY
    • View Profile
    • Texas Gun Forum
Re: 10.5 in vs 16 in AR (556) shooting distance
« Reply #12 on: June 11, 2019, 08:50:15 AM »
Note - I bumped this thread over to the rifle section of the forum

Offline Axxe55

  • Concealed Carry Pro
  • ****
  • Posts: 2179
  • Trophy Husband! Just ask my wife!
    • View Profile
Re: 10.5 in vs 16 in AR (556) shooting distance
« Reply #13 on: June 12, 2019, 12:17:28 AM »
Personally, if I were going to go with an AR pistol configuration, or the SBR route, with using a 10" barrel, I would probably look into the 300 Blackout round in the AR, or even possibly the 9mm. The 300 Blackout is pretty much tailored for short barrels and suppressors, and are gaining in popularity in the AR platforms over the last few years.
Misguided Miscreant!
North of Hell, and South of Heaven. Texas, by God!
"It is far better to die on your feet, than to live on your knees."
Remember the Alamo.
NRA Member. TSRA Member.
"I have one nerve left, and it seems there is that one idiot that feels the need to get on it."
"Go ahead, make my day." Dirty Harry. (Carries a 44 Magnum. Nuf said.)

Offline TXAZ

  • Gun Guru
  • ******
  • Posts: 7240
  • أنا لست إرهابياً
    • View Profile
Re: 10.5 in vs 16 in AR (556) shooting distance
« Reply #14 on: June 12, 2019, 09:23:03 AM »
Yes there will be a substantially difference.

It's not an AR, but a Barrett .50 in 20" and 29" barrels will have just over a 10% difference in muzzle velocity, which is a little over 20% muzzle energy difference.

A smaller barrel shouldn't be quite a kind in barrel difference muzzle velocity.
.

Offline AKM-47

  • Brass Hoarder
  • ****
  • Posts: 1351
    • View Profile
Re: 10.5 in vs 16 in AR (556) shooting distance
« Reply #15 on: July 06, 2019, 09:48:40 PM »
He's now looking at 12 to 14 in. barrel pistols

Offline AKM-47

  • Brass Hoarder
  • ****
  • Posts: 1351
    • View Profile
Re: 10.5 in vs 16 in AR (556) shooting distance
« Reply #16 on: July 07, 2019, 10:43:24 PM »
He sent me this video....




Offline AKM-47

  • Brass Hoarder
  • ****
  • Posts: 1351
    • View Profile
Re: 10.5 in vs 16 in AR (556) shooting distance
« Reply #17 on: July 07, 2019, 10:56:47 PM »
and just sent me this one


Offline AdioSS

  • 7 Yard Shooter
  • ***
  • Posts: 560
    • View Profile
    • VEPR.org
Re: 10.5 in vs 16 in AR (556) shooting distance
« Reply #18 on: July 08, 2019, 09:13:04 PM »
This doesn’t sound good for my 7.5” barrel 5.56 pistol... But it’s fun  :thumbsup1:
Cheston

Offline Lrdplatypus

  • Concealed Carry Pro
  • ****
  • Posts: 2382
  • I'm the Lord of the Platypi. Seriously.
    • View Profile
    • The Platypus Manifesto
Re: 10.5 in vs 16 in AR (556) shooting distance
« Reply #19 on: July 15, 2019, 11:55:29 AM »
The real answer here is "buy a Tavor and don't worry about barrel length ever again"  :P :P :P
I have a few guns.

"If you could kick the person in the pants responsible for most of your trouble, you wouldn't sit for a month." -Theodore Roosevelt

"...for I know whom I have believed, and am persuaded that he is able to keep that which I have committed unto him against that day." II Timothy 1:12