Archive for the 'Ammunition' Category



More Testing On Bullet Effectiveness And Barrel Twist Rate

BY Herschel Smith
6 hours, 42 minutes ago

I say more in the post title because there’s already been a lot of that testing.  Watch Andrew’s testing and listen to his points all the way to the end, and then I have some remarks.

We’ve discussed this many times before, and linked various articles on this: Small Caliber Lethality: 5.56mm Performance in Close Quarters Battle (note that links to this paper in previous posts are broken but this one works), 5.56X45mm Versus 7.62X39mm, AR-15 Ammunition and Barrel Twist Rate, and a CFD analysis entitled Prediction of Projectile Performance, Stability, and Free-Flight Motion Using Computational Fluid Dynamics.

I had never even once believed that the reason for a change of barrel twist had to do with yaw inside tissue.  The real reason is found elsewhere.

Accuracy cannot be assessed without addressing the rifle barrels’ twist-rates. In the early 1980s the M855’s 62-grain bullet was developed for the M249 Squad Automatic Weapon (SAW). For purposes of interoperability, the same load was adopted as the M16A2 rifle’s standard ball as well. A February 1986 U.S. Army study noted that the M855’s bullet required a “1:9 twist [which] would be more appropriate for the M16A2 rifle, improving accuracy and reliability.” Multiple studies confirmed the 1:9-inch twist requirement.

But then a problem arose. The U.S. military’s standard M856 5.56 mm tracer round was longer, heavier (63.7 grains) and slower than the M855 ball, and simply would not stabilize with a 1:9-inch twist barrel. Thus, despite it doubling M855 group sizes, the M16A2 (and later, the M4) specified a 1:7-inch rate-of-twist barrel to stabilize the tracer round. It remains so to this day. Therefore, M855A1 was test-fired with both 1:7- and 1:9-inch twist barrels, and it was verified that this new cartridge is consistently more accurate in the latter barrels-as was its predecessor.

Note that in these articles I’ve also cited contacts in the industry who claim that this concern is a bit overblown, and that a barrel twist of 1:9 is perfectly sufficient to stabilize bullets up to and including 62 and 65 grains, and even 77 and 80 grains. Some of this has to do with barrel manufacturing procedures and quality.

I think Andrew just confirms what we already knew.

Paul Harrell: 62 Grain Versus 77 Grain 5.56mm

BY Herschel Smith
2 days, 8 hours ago

BLUF: The 77 grain bullets did more damage in the meat targets.  But as always, check the ammunition you’re using for zero, accuracy and precision.

Questions On The 6.8 SPC

BY Herschel Smith
5 days, 6 hours 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.

6 Dying Rifle Cartridges that Deserve a Second Chance

BY Herschel Smith
3 weeks, 1 day ago

Field & Stream.

The .30 Remington AR was introduced by Remington in 2008, just in time for the Obama-inspired AR buying frenzy. It couldn’t have come at a worse time. Everybody wanted an AR15, but not for hunting, which is the 30 Remington AR’s forte. The same stupidness that would eventually lead Remington to bankruptcy pushed the cartridge into obscurity. Some early advertisements for the 30 Remington AR listed the cartridge’s 300-yard velocity as its muzzle velocity. Even more foolishly, Remington never offered a blister-packaged complete upper receiver and magazine to allow shooters an easy conversion from an AR-15 in .223 Remington.

Designed specifically for the AR-15 platform, the .30 Remington AR will push a 150-grain bullet to almost 2600 fps and a 125-grain bullet to about 2800 fps. Nothing else in the AR-15 platform comes close, and with that rifle twice as popular now as it was a decade ago, it’s time for this cartridge to return and make the AR-15 all that it can be for the hunter. Some folks get it through. Every year Melvin Forbes at New Ultra Light Arms sells several .30 Remington AR rifles in his less than five-pound bolt-action Model 20-Short rifles. I have mine and the deer in West Virginia hate me for it.

I have little interest in the rest of them, but I sure would like to see a comeback for this particular round.  I missed this when it came out, probably because no one chambered a rifle for this round.

Does .22 Magnum Rival .380 ACP? Ballistic Test

BY Herschel Smith
1 month, 1 week ago

He seems to think not, but I’m very impressed at the performance of the .22 magnum.  I certainly wouldn’t have a problem carrying a .22 magnum revolver as an ankle gun for personal defense.

What Happened To Kentucky Ballistics?

BY Herschel Smith
1 month, 2 weeks ago

Whew!

.44 Special VS .45 ACP Buffalo Bore Barnes TAC-XP

BY Herschel Smith
3 months ago

Hmm … I have three comments.

First, I’m very impressed with the expansion of the Buffalo Bore PD ammunition.

Second, I’m not sure I’d claim that Buffalo Bore didn’t use +P brass on this round until they confirm that.

Third, as for the so-called “Glock Smile” (a term which I’ve never heard before), I’ve shot Buffalo Bore ammunition as well as Double Tap ammunition in 1911s and never seen this before, including with 450 SMC (Short Magnum Cartridges, super hot .45 ACP cartridges from Double Tap with a rifle primer versus a pistol primer), rated at 1120 FPS for a 230 gr. bullet.  I’ve Never seen it before.  Maybe it’s called “Glock Smile” because of the way it seats in the chamber?

I don’t know.  I don’t do Glocks.

Is 1:9 Twist Enough To Stabilize 77 Grain Matchking Bullets?

BY Herschel Smith
3 months, 3 weeks ago

In previous posts we’ve discussed barrel twist and stabilization of heavier 5.56mm rounds.  I’d say that 1:9 twist is just fine for 77 grain bullets based on his results.  Then again, Rock River Arms makes good machines.

Paul Harrell: Hornady .223 TAP Ammo

BY Herschel Smith
4 months ago

Review: Federal .357 Magnum HammerDown Ammunition

BY Herschel Smith
4 months ago

Shooting Illustrated.

As the velocities of metallic cartridges increased and as rifle cartridges become significantly more powerful than handgun cartridges, things begin to change. If a shooter wanted a rifle, they generally wanted a rifle cartridge that would drastically extend the reach and hit harder than a handgun. Still, some revolver cartridges continued to be popular in rifles. With modern munitions, however, a popular revolver cartridge like the .357 Mag.—delivering about 1,200 to 1,400 fps out of a 4-inch revolver—will push the same bullet as much as 400 fps or faster out of a 16- or 18-inch-barrel rifle.

This created a problem for bullets. Modern projectile technology would allow ballistic engineers to create a bullet for .357 Mag. that could perform quite well at handgun or rifle velocities. What was challenging was to create something that would deliver expansion, maintain its weight and deliver decent penetration when fired from a short-barreled handgun as well as a rifle. You see, velocity is the driving force behind terminal performance, and bullets are typically designed to work within a certain velocity range. Extending that performance range so acceptable terminal performance can be had at impact velocities as low as 1,000 fps and as high as 1,800 fps has, at least until now, been similar to the search for Bigfoot.

I found myself trying to solve this conundrum of ammunition selection when I began working with a Ruger 77/357 bolt-action rifle I wanted to set up as a general-purpose rifle and as my companion to a concealed-carry and a general-purpose revolver.

[ … ]

Out of a snubnose revolver, the HammerDown load penetrated 15.5 inches and deformed with a frontal diameter 1.5X caliber. Out of the 4-inch revolver, the bullet penetrated 20 inches and across the front it measured 1.6X the unfired bullet diameter. And, out of the 18-inch barrel of the rifle, the 170-grain bonded bullet pushed to 22 inches and had a recovered frontal diameter that measuring 1.3X its original diameter. Unlike Critical Duty, which only showed a 400 fps (38 percent) velocity increase between the 2- and 18-inch barrels, the HammerDown load jumped from 1,102 fps out of the snubby to 1,773 fps out of the rifle, a 61-percent increase in velocity.

The point of all this is that if you’re a fan of the .357 Mag., and if you would like a single load suitable for hunting, predator defense and personal protection—a general-purpose or Bigfoot-capable load—you now have a fantastic option.

Left unmentioned are two things.  The first may be just an editorial preference, and that is that the ammunition design also incorporates certain features like chamfering at key parts of the cartridge to reduce misfeeds.

The second is the important one.  This is a designer, boutique ammunition, and the difficulty at the moment is finding ammunition at all.

Finally, just try to located a Ruger 77/357 or for that matter a Ruger 77/44 today.  They’ve been discontinued.

Oh, so then look for a Henry X Model in 357 magnum or 44 magnum.  Nope.  Cannot be found either.


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 (149)
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 (1,361)
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 (1,345)
Guns (1,862)
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 (47)
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.