October 15th, 2018

.223 Remington vs. 5.56x45mm — Facts vs. Fiction

.223 Rem Remington 5.56 SAAMI CIP 5.56x45 5.56x45mm NATO cartridge ammo pressure test luckygunner ultimatereloader Gavin Gear

Probably the most popular centerfire rifle round in the Western Hemisphere is the .223 Remington and its metric match, the 5.56x45mm. Though many folks use “.223 Rem” and “5.56×45″ interchangeably, there are some meaningful differences in specifications for the original .223 Rem and the 5.56x45mm cartridge, as adopted by the U.S. military and NATO armies. The default chamber throats are slightly different and the .223 Rem is rated at 55,000 PSI vs. 62,366 PSI for the 5.56x45mm.*

.223 Rem vs 5.56x45mm — Key Differences
There is a truly outstanding, very thorough article on the subject, published by LuckyGunner.com.** This involved extensive testing, with pressure monitors, of 5.56x45mm ammo in .223 Rem chambers. Those tests revealed the peak pressures. Here is one of the ammo test charts:

.223 Rem Remington 5.56 SAAMI CIP 5.56x45 5.56x45mm NATO cartridge ammo pressure test luckygunner ultimatereloader Gavin Gear

NOTE: “The observed chamber pressure for Federal XM855 5.56mm ammunition in a .223 Rem chamber exceeded .223 maximum pressures, but not by a massive amount. The ninth shot (the red line) was an underpowered cartridge which exhibited significantly lower velocity and pressure than the other rounds, so it was excluded from the average velocity and pressure numbers for this chamber.”

And if you’re curious, LuckyGunner also fired .223 Rem ammo in a 5.56x45mm NATO-chambered AR15 rifle. As you would expect, the peak pressures were significantly lower, but the .223 Rem ammo still cycled the semi-auto AR-platform rifle perfectly well:

.223 Rem Remington 5.56 SAAMI CIP 5.56x45 5.56x45mm NATO cartridge ammo pressure test luckygunner ultimatereloader Gavin Gear

READ FULL LuckyGunner .223 Rem vs. 5.56x45mm ARTICLE »

UltimateReloader.com Explains .223 Rem vs. 5.56x45mm
To explain the key differences between the .223 Rem and 5.56x45mm cartridges our friend Gavin Gear of UltimateReloader.com has created a very thorough 12-minute video. This covers the cartridge specifications and explains key considerations for hand-loaders. Gavin also addresses the oft-asked question “Can I shoot 5.56x45mm ammo in my .223 Rem chamber?” Gavin’s video is definitely worth watching. In fact, this is one of the most popular videos Gavin has ever created — it has been watched over 300,000 times on YouTube.

What Exactly Is the 5.56x45mm NATO Cartridge?
The 5.56×45mm NATO is a rimless bottle-necked intermediate cartridge family standardized by NATO with development work by FN Herstal. It consists of the SS109, SS110, and SS111 cartridges. Under STANAG 4172, it is a standard cartridge for NATO forces as well as many non-NATO countries.

Bullet diameter: 5.70 mm (0.224 in)
Maximum pressure (EPVAT): 430.00 MPa (62,366 psi)
Maximum pressure (SCATP 5.56): 380.00 MPa (55,114 psi)
Case length: 44.70 mm (1.760 in)
Rifling twist: 178 mm or 229 mm (1 in 7 in)
Parent case: .223 Remington (M193)

Ammo-Maker Federal Premium Compares .223 Rem and 5.56x45mm
Here is a video from ammo-maker Federal Premium explaining the difference between .223 Remington and 5.56x45mm NATO. Federal states that you may experience excessive pressures when firing a 5.56x45mm in a standard .223 Remington chamber:

One leading gunwriter has addressed the question of shooting 5.56x45mm ammo in .223 Rem chambers. He advocates caution (for more info, SEE pressure tests by LuckyGunner.com):

“I have received a slew of questions — many from first time AR-type rifle buyers — about the .223 Rem and the 5.56×45 mm NATO cartridges. Can I shoot 5.56×45 mm NATO in my .223 and vice-versa? Are these the same cartridge?

Externally, the two cartridge cases are identical. The main differences are that 5.56×45 mm NATO operates at a higher chamber pressure (about 60,000 PSI versus 55,000 PSI on the .223 Rem.) and the 5.56’s chamber is slightly larger than that of the .223 Rem. Also, the throat or leade is longer in the 5.56×45 mm chamber. What does this mean? You should not shoot 5.56×45 mm NATO out of a rifle that is chambered in .223 Rem. And be aware that some .223 Rem. ammunition will not reliably cycle through some AR-style .223 Rem. rifles, but it usually does. As a matter of fact, I have not encountered any difficulty with current .223 Rem. loads cycling through a 5.56 mm AR-style rifle.”
– Mark Keefe, Editor, American Rifleman


* According to the official NATO proofing guidelines, the 5.56×45mm NATO case can handle up to 430.0 MPa (62,366 psi) piezo service pressure. The U.S. SAAMI lists Maximum Average Pressure (MAP) for the .223 Remington cartridge as 55,000 psi (379.2 MPa) piezo pressure with deviation of up to 58,000 psi (399.9 MPa). The chamber for military 5.56×45mm NATO has a longer throat prior to the bullet contacting the rifling which results in lower pressures when firing 5.56×45mm NATO ammunition. If 5.56×45mm NATO is used in rifles chambered for .223 Remington the bullet will be engraving the rifling when chambered. which can increase pressures past SAAMI Max levels. NOTE: The C.I.P. standards for the C.I.P. civilian .223 Remington chamber are much closer to the military 5.56×45mm NATO chamber.

** The full-length LuckyGunner article is well worth reading. It even provides specifications for a number of .223 Rem reamer types, and compares the original .223 Rem, the 5.56x45mm NATO, and the modern .223 Wylde chamberings.

Permalink - Articles, - Videos, Bullets, Brass, Ammo, Tech Tip 2 Comments »
October 15th, 2018

Bargain Finder 160: AccurateShooter’s Deals of the Week

Accurateshooter Bargain Finder Deals of Week

At the request of our readers, we provide select “Deals of the Week”. Every Monday morning we offer our Best Bargain selections. Here are some of the best deals on firearms, hardware, reloading components, optics, and shooting accessories. Be aware that sale prices are subject to change, and once clearance inventory is sold, it’s gone for good. You snooze you lose.

1. CDNN — Browning A-Bolt III Rifle, $349.99 with Rebate

Browning A-Bolt Composite Hunting Stalker Rifle Rebate Bucks Hunter

Here’s an awesome deal on Browning hunting rifles. Browning will give you $100 Cash Back on a wide selection of hunting rigs. For example CDNN now offers the A-Bolt III Composite Stalker in .30-06 Springfield for just $449.99. With Browning’s $100.00 Rebate, you net cost is just $349.99. The same deal is offered for other chamberings, including .243 Win, .270 Win, and 7mm Rem Mag. That’s a great price — you could pay that much just for a custom barrel. NOTE: This Browning Bucks $100 Rebate Program also applies to Browning rimfire rifles and shotguns. There is a $50 Rebate for X-Bolt rifles. To make this deal even sweeter, CDNN is now offering a FREE 3-9x40mm Bushnell scope with each A-Bolt III Rifle sold. Check it out:

Browning A-Bolt Composite Hunting Stalker Rifle Rebate Bucks Hunter

2. Precision Reloading — Discounts on All Powders in Stock

Precision Reloading Powder Sale

Right now Precision Reloading is running a big sale on reloading powders. Save 10% or more on all leading powder brands: Accurate, Alliant, Hodgdon, IMR, Norma, Ramshot, Vihtavuori, and Winchester. The sale applies to all one-pound containers, as well at 5-lb and 8-lb jugs. If you need powder, don’t hesitate — this promotion ends 10/19/2018 at 11:59 pm. NOTE: In addition to powders, Precision Reloading has CCI primers on sale this week — save up to 17% on all CCI primer types.

3. Midsouth — Lyman Brass Smith Ideal Press, $69.99

Lyman C-Frame Ideal compact press cast iron

Lyman’s new Ideal compact press works great as a second, lighter-duty press. It also is a good choice for loading at the range. It can easily be mounted to a range bench with C-clamps. With its cast-iron body, this C-Frame press is stronger than other presses in its price class. If you are looking for a secondary press for decapping, bullet-seating and other tasks not requiring heavy leverage, this is an excellent choice. The Lyman Ideal costs just $69.99 at Midsouth Shooters Supply.

4. Midsouth — 10% Off All Sierra Bullets

Midsouth Shooters Sierra Bullet Bullets Sale

Need match or hunting projectiles? All Sierra bullets are on sale right now at Midsouth Shooters Supplies. Save 10% on Sierra match, hunting, and varmint bullets, including regular and tipped bullets. Competitors take note — Sierra’s MatchKing bullets are top performers in many disciplines. The 6mm and 6.5mm MatchKings are great for PRS, and the new heavy (183gr and 197gr) 7mm MatchKings (pointed at the factory) have worked great for F-Open shooters. Here are some of the great deals:

6mm 110gr BTHP MatchKing (100) — $36.18 marked down from $40.20
6.5mm 142gr BTHP MatchKing (100) — $39.45 marked down from $43.84
7mm 183gr BTHP MatchKing (100) — $44.255 marked down from $49.16

5. MidwayUSA — Big Sale on Zeiss V4, V6, and V8 Riflescopes

Midway MidwayUSA Zeiss scope optics V4 V6 hunting riflescope Sale

Zeiss makes great scopes with superb glass, reliable tracking, and very positive clicks. Now you can save hundreds on Zeiss V4, V6, and V8 optics. The V4 is an affordable scope for hunters, while the V8 Line offers a stunning 8X zoom ratio. The V6 models, with 6X zoom ratio, are outstanding scopes that compete very well with Nightforce and other top brands on price and performance. Competition and long range shooters should definitely look at the V6 line-up. NOTE: These discounts are part of a Zeiss Field Days promotion running through 10/29/2018. See similar incentives at other retailers.

6. EuroOptic — Leica Geovid 10×42 HD-B 2200 LRF Binoculars

leica geovid binocular 10x42 HD HD-B 2200 3000 Eurooptic Sale

Leica’s outstanding Geovid 10×42 binoculars feature a built-in laser rangefinder rated to 2000 yards. We’ve used this HD-B 2000 unit and the optics are superb and the rangefinding is super fast. When placed on a tripod for support we were amazed at the ranging ability of these Geovids. Give credit to great glass, minimal beam divergence and Leica’s excellent error correction software. Act now and you can save $1000 over the original price. Note: This is discontinued model that has been replaced by the newer Leica HD-B 3000, priced at $2999.00.

7. Brownells — Sig P320 9mm Pistol, $399.99

Brownells Sig Sauer p320 pistol carry compact 9mm

The new SIG P320 is one of the best compact 9mm carry guns on the market. Accurate, slim, and reliable, it has earned praise from owners and reviewers alike. Yes we would rather carry a P320 than a sub-compact Glock. This modular, striker-fired pistol features a sub-compact grip, slim slide, and Night Sights. Safety features include a striker safety and disconnect safety. Brownells’ sale price is $399.99, marked down from $579.99. NOTE: Some buyers report you can get an extra $20 OFF with code “M8Y” entered on the final payment screen.

8. Midsouth — Hornady 17 HMR Ten Boxes for $84.99

Hornady 17 HMR week deal varmint V-Max ammo ammunition sale

Varmint hunters take note. Here’s a great deal on premium 17 HMR ammo. Midsouth is selling 500 rounds of Hornady 17 HMR ammo for $84.99. That works out to just $8.50 per 50-rd box — the best price we’ve seen in a while. Loaded with 17gr V-Max bullets, this ammo is accurate — expect about 1 MOA at 100 yards in a good rifle. The V-Max bullets are effective on small varmints out to 200 yards.

9. Amazon — Two Rolls of 3″ Neon Target Stickers, $14.95

Red Orange Neon 3

We like these bright, Neon 3″ target stickers. They are big enough to see easily at 600 yards, giving you a 1/2 MOA target center at that distance. For $14.95 at Amazon.com, you get 250 3″-diameter self-adhesive centers (125 targets per roll) that stick to almost any surface The high-contrast fluorescent red/orange color provides an excellent HI-VIZ aiming point, along with good contrast for bullet holes that fall within the 3″ circle. To help line up your reticle cross-hairs, the target centers feature black markers at 3, 6, 9, and 12 0’Clock. NOTE: These stickers may qualify for FREE Shipping with combined orders over $25.00.

Permalink Bullets, Brass, Ammo, Handguns, Hot Deals, Optics No Comments »
October 15th, 2018

Do You Carry a Handgun? Smart Advice for CCW Holders

Beretta CCW Ten Tips Concealed Carry Guide Instruction book

Do you have a concealed carry permit, or do you plan to carry a concealed handgun in the future? Then you can benefit from Beretta’s FREE 15-page e-book, Ten Essential Tips for CCW Holders. This eBook, in handy PDF format, helps gun owners select an appropriate handgun (and holster), understand legal obligations and responsibilities, and train effectively with the firearm. This short eBook offers many useful tips to consider, in particular for gun owners who are contemplating the pros and cons of everyday carry for themselves.

CLICK HERE for 10 Essential Tips for CCW Holders »

As the Beretta CCW booklet says, “Carrying a concealed handgun requires a certain amount of confidence. You need to be confident in your knowledge of laws and regulations. You have to have confidence in your accuracy, and you need to trust that you can carry a gun effectively, securely and comfortably. If a gun is a burden for you to carry, you probably won’t.”

Surprising Facts About Actual Defensive Handgun Use
You may be surprised to learn when and how handguns are actually used for self-defense. Most defensive uses are at very short range and the incident only lasts a matter of seconds. You need to be prepared, and train to be proficient drawing and aiming your weapon. And remember, shooting is a last resort, when a safe retreat is not available.

55% of gunfights take place in 0-5 feet.
20% of gunfights take place in 5-10 feet.
20% of gunfights take place in 10-21 feet.
95% of gunfights take place in 0-21 feet. (Source: FBI)
The average man can cover 21 feet of ground in 1.5 seconds.
The average gunfight is over in 3-5 seconds.
3 to 4 shots are usually fired.
Most gunfights take place in low-light conditions.
On average, one shot in four strikes someone.

Here are two (2) sample pages from Beretta’s CCW eBook.

Beretta CCW Ten Tips Concealed Carry Guide Instruction book

Beretta CCW Ten Tips Concealed Carry Guide Instruction book

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