Questions On The 6.8 SPC

BY Herschel Smith
1 week ago

Here are some interesting articles on the 6.8 SPC: [1] (in which our own Georgiaboy61 figures prominently in the comments), [2], [3], [4], [5], [6], and [7].

Points.  Some discussions focus on the 6.8 SPC and 6.8 SPC II, stating that most rifles released today chambered for this round are for the 6.8 SPC II, even though that’s not the SAAMI spec round.

Next, it’s my understanding that a 6.8 SPC upper receiver can be coupled with any milspec AR-15 lower receiver.

Finally, within 100 – 200 yards, it appears to be fairly well established that this is a fine round for whitetail deer (perhaps not mule deer).

Comments and observations on this round, and/or any of the points above?  It seems that this would be a fine option for deer hunting without purchase of a new complete rifle.


Comments

  1. On June 11, 2021 at 2:49 am, Chris said:

    “6.8 SPC upper receiver can be coupled with any milspec AR-15 lower receiver.”

    I have a Original 6.8 Shorty Piston type (10yrs old anyway-brand not important) and that upper runs like a purring kitten, it just runs, on my LEGALY(for you atf) owned SF Lower.
    Suppressed is even better.
    Mags-mix of 556 and Barrett. No Issues as of now.
    Ammo-whatever brass cased u.s. made 115otm’s i can find.
    I am speaking from a …moderate round count here.
    Real Life CQB. It aint gonna be protracted if your enemy has any skills.

    Pleasent to run might i add.

    I bought it and also built a 16” that is SPEC II
    For what appear to be the correct reasons.
    CQB out to 300-400 max.

    The 16” has a Pricey bolt, carrier and barrel. That upper and lower are a “Matched Set” says the company. They are tight!
    Glass is 1-4pwr MIL reticule vortex.
    The thing is a .3 to .4mil gun allday at 100.(roughly a inch to a inch plus)
    Even after running it allday at a a training facility.

    I always start with zeroing (5rds) and end with zeroing(5rds) at the end of a “Paying” training day. Lets me, understand the weapon and it’s ballistics.
    Point here is filth, copper and accuracy.

    They run you harder and longer than you do yourself at home(if your that lucky) or the “sand pit” (public ranges, round us anyway dont want …hoppin poppin and communicating)

    Thats the only thing (i) can factually say.
    Perhaps I just got lucky. Even though luck has never really been my buddy. Haha.

    I can not speak to hunting, i just dont. Lazy.
    And hope to NEVER have to speak to 2 legged rabid animals type.
    Buuuut, I’m pert sure…
    for the purpose I got it..
    It’ll do what I need within those parameters.

    Ammo..has never been super plentifull (i have quite abit of Original SSA 115otm’s,) and its real tough right now.
    If you didnt have a stash before, i doubt very few ever will for sustained use.
    Had I NOT already been …vested
    i dont think i ever would pick it as a First gun or primary.

    All i got

  2. On June 11, 2021 at 11:44 pm, The Wretched Dog said:

    Shorter answer: “It seems that this would be a fine option for deer hunting without purchase of a new complete rifle.” – Yes; the only drawback is you need purpose designed magazines. Due to the larger case diameter, 6.8SPC do not stack properly in 5.56 magazines.

    So you need an upper, and a few 6.8SPC (or 6.5 Grendel) magazines.

    Longer answer: In reference to the first article:

    “It is very curious to me that a round that was designed with an accurized designated marksman’s rifle in mind also features such a short ogive and low muzzle velocity. Typically, medium/long range precision weapons platforms place a premium on both the ballistic coefficient and velocity of the projectile, seeking to obtain as laser-like a trajectory and as high a retention of energy as possible. The 6.8mm SPC runs directly counter to this.”

    The 6.8 SPC was not, repeat not, originally designed for the designated marksman role, that is – medium/long-range precision; it was designed to provide significantly improved terminal performance in direct combat out of 14.5-inch M4 barrels. Its significant design configuration was intended to obtain all of the cartridge’s potential velocity in 14.5 inches of barrel, with twice the mass of the 5.56mm. To drop opponents in their tracks at the short ranges where green-tip zipped right through.

    Despite Remington’s problems with the original cartridge development/performance, the 6.8 SPC II achieves its design purpose, and is an excellent intermediate caliber choice for an AR-15 platform. (The current Army initiative to field a future 6.8mm cartridge is a different program; with different purposes.)

    I don’t hunt. If I did, I would choose my 6.8 over a 5.56 any and every day. Son no. 2 has a 6.5 Grendel. We argue which is better. I’ll give him the edge for longer shots due to ballistic efficiency, but at practical (less than 400 yard) ranges, there isn’t much difference.

    However, Alexander Arms 6.5 Grendel magazines are very superior to the 6.8SPC mags I have. The cartridge diameters are close enough that either cartridge works in either magazine. Sadly, neither the 6.8 SPC, nor the 6.5 Grendel are compatible with the standard 5.56 mag – the ribs are shallower (you can load about 8 to 10 rounds before the 5.56 magazine bulges such that it won’t clear the magazine well. I do not know whether the 6.8SPC chambers reliably using a down-loaded 5.56 mag; I haven’t tried that.)

    So, yes, I like my 6.8SPC very much, especially with an 18-inch barrel (rather than the standard 16-inch civilian barrel). But, with the standard commercial loads, I doubt I am getting any velocity bump with the longer barrel; I just like the way the 18-inch length handles.

    TWD

  3. On June 11, 2021 at 11:47 pm, The Wretched Dog said:

    I might add: go check out Bison Armory for very fine 6.8 barrels or uppers (when they can keep up with demand). Also .224 Valkyrie.

    Note: I have no financial interest in Bison Armory. I am just a satisfied customer.

    TWD

  4. On June 12, 2021 at 9:58 am, Ned said:

    LWRCI makes 6.8 dedicated receivers and full rifles that work better than standard 5.56 lowers. https://www.lwrci.com/SIX8-A5-Razorback-II_p_264.html

  5. On June 12, 2021 at 9:38 pm, The Wretched Dog said:

    Ned: Define “work better with standard 5.56 lowers.” I do not understand what the purported issue is with mating a 6.8 SPC upper to an AR-15 lower – they are compatible.

    My first 6.8SPC was a 16-inch barreled upper that I swapped onto my DPMS AR-15 lower. Recently, I replaced the 16-in 6.8SPC upper with one from Bison Armory with an 18-inch barrel – merely because I prefer the 18-in configuration (my 5.56 rifle also has an 18-in barrel).

    Both uppers mate flawlessly to, and function flawlessly with, a ‘standard’ AR-15 lower.

    TWD

  6. On June 12, 2021 at 10:04 pm, Brad said:

    I’m thinking just go with 300 ACC and quit wasting your time.

  7. On June 14, 2021 at 8:19 am, Ned said:

    Wretched Dog: Should have said work better with the oversize 6.8 Magpul mags they were designed specifically to use.

RSS feed for comments on this post. TrackBack URL

Leave a comment


You are currently reading "Questions On The 6.8 SPC", entry #27582 on The Captain's Journal.

This article is filed under the category(s) Ammunition,Firearms,Guns and was published June 10th, 2021 by Herschel Smith.

If you're interested in what else the The Captain's Journal has to say, you might try thumbing through the archives and visiting the main index, or; perhaps you would like to learn more about TCJ.

26th MEU (10)
Abu Muqawama (12)
ACOG (2)
ACOGs (1)
Afghan National Army (36)
Afghan National Police (17)
Afghanistan (679)
Afghanistan SOFA (4)
Agriculture in COIN (3)
AGW (1)
Air Force (35)
Air Power (9)
al Qaeda (83)
Ali al-Sistani (1)
America (21)
Ammunition (150)
Animals (99)
Ansar al Sunna (15)
Anthropology (3)
Antonin Scalia (1)
AR-15s (277)
Arghandab River Valley (1)
Arlington Cemetery (2)
Army (79)
Assassinations (2)
Assault Weapon Ban (27)
Australian Army (6)
Azerbaijan (4)
Backpacking (2)
Badr Organization (8)
Baitullah Mehsud (21)
Basra (17)
BATFE (115)
Battle of Bari Alai (2)
Battle of Wanat (18)
Battle Space Weight (3)
Bin Laden (7)
Blogroll (3)
Blogs (22)
Body Armor (20)
Books (3)
Border War (11)
Brady Campaign (1)
Britain (38)
British Army (35)
Camping (4)
Canada (3)
Castle Doctrine (1)
Caucasus (6)
CENTCOM (7)
Center For a New American Security (8)
Charity (3)
China (14)
Christmas (12)
CIA (28)
Civilian National Security Force (3)
Col. Gian Gentile (9)
Combat Outposts (3)
Combat Video (2)
Concerned Citizens (6)
Constabulary Actions (3)
Coolness Factor (2)
COP Keating (4)
Corruption in COIN (4)
Council on Foreign Relations (1)
Counterinsurgency (216)
DADT (2)
David Rohde (1)
Defense Contractors (2)
Department of Defense (167)
Department of Homeland Security (26)
Disaster Preparedness (4)
Distributed Operations (5)
Dogs (12)
Donald Trump (26)
Drone Campaign (3)
EFV (3)
Egypt (12)
El Salvador (1)
Embassy Security (1)
Enemy Spotters (1)
Expeditionary Warfare (17)
F-22 (2)
F-35 (1)
Fallujah (17)
Far East (3)
Fathers and Sons (2)
Favorite (1)
Fazlullah (3)
FBI (32)
Featured (185)
Federal Firearms Laws (18)
Financing the Taliban (2)
Firearms (1,362)
Football (1)
Force Projection (35)
Force Protection (4)
Force Transformation (1)
Foreign Policy (27)
Fukushima Reactor Accident (6)
Ganjgal (1)
Garmsir (1)
general (15)
General Amos (1)
General James Mattis (1)
General McChrystal (43)
General McKiernan (6)
General Rodriguez (3)
General Suleimani (9)
Georgia (19)
GITMO (2)
Google (1)
Gulbuddin Hekmatyar (1)
Gun Control (1,346)
Guns (1,863)
Guns In National Parks (3)
Haditha Roundup (10)
Haiti (2)
HAMAS (7)
Haqqani Network (9)
Hate Mail (8)
Hekmatyar (1)
Heroism (4)
Hezbollah (12)
High Capacity Magazines (16)
High Value Targets (9)
Homecoming (1)
Homeland Security (1)
Horses (1)
Humor (35)
ICOS (1)
IEDs (7)
Immigration (93)
India (10)
Infantry (4)
Information Warfare (2)
Infrastructure (2)
Intelligence (23)
Intelligence Bulletin (6)
Iran (170)
Iraq (379)
Iraq SOFA (23)
Islamic Facism (64)
Islamists (95)
Israel (18)
Jaish al Mahdi (21)
Jalalabad (1)
Japan (2)
Jihadists (80)
John Nagl (5)
Joint Intelligence Centers (1)
JRTN (1)
Kabul (1)
Kajaki Dam (1)
Kamdesh (9)
Kandahar (12)
Karachi (7)
Kashmir (2)
Khost Province (1)
Khyber (11)
Knife Blogging (4)
Korea (4)
Korengal Valley (3)
Kunar Province (20)
Kurdistan (3)
Language in COIN (5)
Language in Statecraft (1)
Language Interpreters (2)
Lashkar-e-Taiba (2)
Law Enforcement (4)
Lawfare (7)
Leadership (6)
Lebanon (6)
Leon Panetta (2)
Let Them Fight (2)
Libya (14)
Lines of Effort (3)
Littoral Combat (8)
Logistics (50)
Long Guns (1)
Lt. Col. Allen West (2)
Marine Corps (266)
Marines in Bakwa (1)
Marines in Helmand (67)
Marjah (4)
MEDEVAC (2)
Media (59)
Medical (60)
Memorial Day (6)
Mexican Cartels (35)
Mexico (51)
Michael Yon (6)
Micromanaging the Military (7)
Middle East (1)
Military Blogging (26)
Military Contractors (4)
Military Equipment (24)
Militia (5)
Mitt Romney (3)
Monetary Policy (1)
Moqtada al Sadr (2)
Mosul (4)
Mountains (25)
MRAPs (1)
Mullah Baradar (1)
Mullah Fazlullah (1)
Mullah Omar (3)
Musa Qala (4)
Music (23)
Muslim Brotherhood (6)
Nation Building (2)
National Internet IDs (1)
National Rifle Association (72)
NATO (15)
Navy (22)
Navy Corpsman (1)
NCOs (3)
News (1)
NGOs (2)
Nicholas Schmidle (2)
Now Zad (19)
NSA (3)
NSA James L. Jones (6)
Nuclear (57)
Nuristan (8)
Obama Administration (221)
Offshore Balancing (1)
Operation Alljah (7)
Operation Khanjar (14)
Ossetia (7)
Pakistan (165)
Paktya Province (1)
Palestine (5)
Patriotism (7)
Patrolling (1)
Pech River Valley (11)
Personal (65)
Petraeus (14)
Pictures (1)
Piracy (13)
Pistol (2)
Pizzagate (21)
Police (525)
Police in COIN (3)
Policy (15)
Politics (884)
Poppy (2)
PPEs (1)
Prisons in Counterinsurgency (12)
Project Gunrunner (20)
PRTs (1)
Qatar (1)
Quadrennial Defense Review (2)
Quds Force (13)
Quetta Shura (1)
RAND (3)
Recommended Reading (14)
Refueling Tanker (1)
Religion (234)
Religion and Insurgency (19)
Reuters (1)
Rick Perry (4)
Rifles (1)
Roads (4)
Rolling Stone (1)
Ron Paul (1)
ROTC (1)
Rules of Engagement (75)
Rumsfeld (1)
Russia (32)
Sabbatical (1)
Sangin (1)
Saqlawiyah (1)
Satellite Patrols (2)
Saudi Arabia (4)
Scenes from Iraq (1)
Second Amendment (414)
Second Amendment Quick Hits (2)
Secretary Gates (9)
Sharia Law (3)
Shura Ittehad-ul-Mujahiden (1)
SIIC (2)
Sirajuddin Haqqani (1)
Small Wars (72)
Snipers (9)
Sniveling Lackeys (2)
Soft Power (4)
Somalia (8)
Sons of Afghanistan (1)
Sons of Iraq (2)
Special Forces (28)
Squad Rushes (1)
State Department (21)
Statistics (1)
Sunni Insurgency (10)
Support to Infantry Ratio (1)
Supreme Court (28)
Survival (48)
SWAT Raids (55)
Syria (38)
Tactical Drills (2)
Tactical Gear (6)
Taliban (167)
Taliban Massing of Forces (4)
Tarmiyah (1)
TBI (1)
Technology (17)
Tehrik-i-Taliban (78)
Terrain in Combat (1)
Terrorism (95)
Thanksgiving (10)
The Anbar Narrative (23)
The Art of War (5)
The Fallen (1)
The Long War (20)
The Surge (3)
The Wounded (13)
Thomas Barnett (1)
Transnational Insurgencies (5)
Tribes (5)
TSA (22)
TSA Ineptitude (13)
TTPs (4)
U.S. Border Patrol (5)
U.S. Border Security (14)
U.S. Sovereignty (17)
UAVs (2)
UBL (4)
Ukraine (3)
Uncategorized (58)
Universal Background Check (3)
Unrestricted Warfare (4)
USS Iwo Jima (2)
USS San Antonio (1)
Uzbekistan (1)
V-22 Osprey (4)
Veterans (3)
Vietnam (1)
War & Warfare (310)
War & Warfare (40)
War Movies (4)
War Reporting (21)
Wardak Province (1)
Warriors (6)
Waziristan (1)
Weapons and Tactics (71)
West Point (1)
Winter Operations (1)
Women in Combat (21)
WTF? (1)
Yemen (1)

June 2021
May 2021
April 2021
March 2021
February 2021
January 2021
December 2020
November 2020
October 2020
September 2020
August 2020
July 2020
June 2020
May 2020
April 2020
March 2020
February 2020
January 2020
December 2019
November 2019
October 2019
September 2019
August 2019
July 2019
June 2019
May 2019
April 2019
March 2019
February 2019
January 2019
December 2018
November 2018
October 2018
September 2018
August 2018
July 2018
June 2018
May 2018
April 2018
March 2018
February 2018
January 2018
December 2017
November 2017
October 2017
September 2017
August 2017
July 2017
June 2017
May 2017
April 2017
March 2017
February 2017
January 2017
December 2016
November 2016
October 2016
September 2016
August 2016
July 2016
June 2016
May 2016
April 2016
March 2016
February 2016
January 2016
December 2015
November 2015
October 2015
September 2015
August 2015
July 2015
June 2015
May 2015
April 2015
March 2015
February 2015
January 2015
December 2014
November 2014
October 2014
September 2014
August 2014
July 2014
June 2014
May 2014
April 2014
March 2014
February 2014
January 2014
December 2013
November 2013
October 2013
September 2013
August 2013
July 2013
June 2013
May 2013
April 2013
March 2013
February 2013
January 2013
December 2012
November 2012
October 2012
September 2012
August 2012
July 2012
June 2012
May 2012
April 2012
March 2012
February 2012
January 2012
December 2011
November 2011
October 2011
September 2011
August 2011
July 2011
June 2011
May 2011
April 2011
March 2011
February 2011
January 2011
December 2010
November 2010
October 2010
September 2010
August 2010
July 2010
June 2010
May 2010
April 2010
March 2010
February 2010
January 2010
December 2009
November 2009
October 2009
September 2009
August 2009
July 2009
June 2009
May 2009
April 2009
March 2009
February 2009
January 2009
December 2008
November 2008
October 2008
September 2008
August 2008
July 2008
June 2008
May 2008
April 2008
March 2008
February 2008
January 2008
December 2007
November 2007
October 2007
September 2007
August 2007
July 2007
June 2007
May 2007
April 2007
March 2007
February 2007
January 2007
December 2006
November 2006
October 2006
September 2006
August 2006
July 2006
June 2006
May 2006

about · archives · contact · register

Copyright © 2006-2021 Captain's Journal. All rights reserved.