You are Unregistered, please register to use all of the features of!    
Firearm & Gun Forum - > Long Guns > Auto & Semi-Auto Discussion >

.223/5.56 is less suited for short barrels than other chamberings: myth?

LinkBack Thread Tools Display Modes
Old 07-22-2010, 01:50 AM   #1
Feedback Score: 0 reviews
Join Date: Jul 2010
Posts: 2
Default .223/5.56 is less suited for short barrels than other chamberings: myth?

I am getting ready to buy a 16-18" Robinson XCR and am looking to get it in .223 and possibly converting to 6.5 MPC.

My concern regarding the cartridge is that I have read that it loses too much velocity with shorter barrels.

I would like some feedback regarding actual chronographing that may confirm this and a comparison to other calibers, like 6.8 SPC for example.

I love the feature of being able to change barrels quickly in the field with the XCR and would like to start off with a cartridge that will give good performance in shorter barrel lengths, if I decide to use them.
Free men are citizens of THE EARTH, not countries, governments, or other nonsense.

3 laws for prosperous freedom:

1. Respect the life and property of yourself and other individuals.

2. Always maintain your ability to defend yourself.

3. Let no one have power over YOU.
LethalJustice is offline  
Reply With Quote

Join Today - It's Free!

Are you a firearms enthusiast? Then we hope you will join the community. You will gain access to post, create threads, private message, upload images, join groups and more.

Firearms Talk is owned and operated by fellow firearms enthusiasts. We strive to offer a non-commercial community to learn and share information.

Join Today! - Click Here

Old 07-22-2010, 11:27 AM   #2
Feedback Score: 0 reviews
Yunus's Avatar
Join Date: Jan 2009
Location: |,Maryland
Posts: 5,252
Liked 1485 Times on 878 Posts
Likes Given: 466


Stop by the introduction section and let us know a bit about yourself.

I don't have any Chrono numbers but I'm sure they can be googled. I can say though that I have shot multiple AR-15's with 16" barrels, actually 14.5" with a flash suppressor and they are very accurate at up to 200 yards. I don't have much experience beyond 200 yards.
"Good people drink good beer."
Hunter S. Thompson
"Do stupid things, win stupid prizes"
Yunus is offline  
Reply With Quote
Old 07-22-2010, 11:34 AM   #3
Feedback Score: 0 reviews
planenut's Avatar
Join Date: Jan 2010
Location: Charleston, SC,SC
Posts: 129
Liked 4 Times on 2 Posts


I think this is just handguns but maybe it will help...

BBTI - Results
planenut is offline  
Reply With Quote
Old 07-22-2010, 01:05 PM   #4
Lifetime Supporting Member
Feedback Score: 1 reviews
robocop10mm's Avatar
Join Date: Jul 2007
Location: Austin,Texas, by God!!
Posts: 11,395
Liked 4138 Times on 2111 Posts
Likes Given: 523


Pretty much every rifle cartridge shoots faster in a longer barrel (with in reason). Going from a 20" down to a 12" barrel will give significantly less velocity. Small cartridges like the 5.56 rely on speed to give performance. Shorter barrels mean less speed. Larger diameter bullets like the 6.5 SPC rely less on speed and more on mass. Every cartridge is a compromise between bullet weight, velocity, portability, and shootablility. A .50 BMG has high bullet weight, high velocity, terrible portabilty and shootablility. The .22 short has low buellet weight, low velocity, high portability and shootablility. Everything in between is a compromise.

The 5.56 in its military configuration relies heavily on velocity for its wounding capability. Shorter barrels do not give the kind of results that longer barrels do. Since we are not military members (for the most part) bound to international law, we can use expanding or frangible bullets that rely less on velocity because the bullet will expand and do the work for us.

IMHO, there is nothing wrong with a .223/5.56 for defensive purposes as the range of bullet weights and construction allows for one to tailor the ammo to the mission.

The 6.8 SPC is heavier, slower, similar in portability and shootability. One deciding factor may be ammunition cost and availability.
In life, strive to take the high road....It offers a better field of fire.
"Robo is right" Fuzzball
robocop10mm is offline  
Reply With Quote

Thread Tools
Display Modes

Similar Threads
Thread Thread Starter Firearms Forum Replies Last Post
The Myth of Total Disarmament vs. The American Spirit Dillinger Legal and Activism 106 09-08-2012 03:02 AM
The Myth of Knockdown Power KalashnikovJosh General Handgun Discussion 27 06-23-2010 03:15 AM
Short Barrels/Long Barrels,I can't make up my mind ninjatoth Revolver Handguns 9 10-23-2009 07:59 AM
US uses bullets ill-suited for new ways of war sculker The Club House 7 06-01-2008 04:50 AM