ARs in PRS? Yes PRS has a “Gas Gun” division. And frankly, shooting a PRS match is one of the most fun and challenging things you can do with your Black Rifle (Beto O’Rourke notwithstanding). Since the early days of the PRS, Gas Gun shooters have wanted to play. Recognizing the interest among semi-auto shooters, the PRS now offers a Gas Gun Series for semi-auto rifles such as AR15s and AR10s. The Gas Gun Series started in 2017, and has quickly become quite popular.
Photo Credit Michael Cage.
Gas Guns to 800 yards — Yes there are targets down there somewhere.
PRS Gas Gun Series Rules
For the new PRS “Gasser” Competition, the PRS developed rules on gun types, scoring, match timing, penalties, safety and other key topics. CLICK HERE for Full PRS Gas Gun Series Rules.
Open Division: Open Division rifles will not exceed a caliber of .30 or a velocity of 3,200fps. A match DQ will result any rounds over the speed limit of 3,200 fps (+/- 32 fps for environmental factors and equipment discrepancies). Match Officials may request at any point during a match that a competitor fire their rifle through chronograph. If the bullet exceeds the 3,200 fps speed limit, the shooter will receive an automatic match DQ. [“For Ammo in Open Class, 6mm and 6.5mm Creedmoor are popular.” — John Parker, SSUSA]
Tactical Division: Tactical Division: Intended to allow competitors the opportunity tocompete using traditional military and law enforcement caliber. This promotesActive Duty military and law enforcement competitors use of their Service and Department issued rifles. Tactical Light Division rifles are restricted to 5.56 NATO/.223 Remington and 7.62 NATO/.308 Winchester calibers only. .223 Bullet weight cannot exceed 77 grains and muzzle velocity cannot exceed 3,000 fps, .308 bullet weight cannot exceed 178 grains and muzzle velocity cannot exceed 2,800 fps. No modified wildcat rounds permitted to shoot in the Tactical Divisions. Tactical Division shooters will shoot the exact same COF as Open Division shooters. [NOTE: This division now replaces the previous Tactical Light and Tactical Heavy divisions.]
Scoring and Penalties
The Gas Gun Series utilizes a time plus penalty based scoring system for all match scoring. This means your score is your total combined time on all stages plus any penalties you may have accrued.
Stage Course of Fire and Targets
No more than 50% of the stages at a match can utilize an unlimited round count. At least 25% of the targets in Gas Gun Series match must be 2 MOA or smaller. Maximum distance is 800 yards.
The preferred rifle color choice at the first PRS “Gasser” Match was definitely black…
Gas Gun Match Loads — Short Range vs. Long Range
“The .223/5.56 [Tactical Light] guns had some lag time waiting on shot impacts. I believe the long-term solution may be to find a light and fast load for closer stages for near-instant reaction time and use a heavy load for the long shots to see splash and get the target to move a little more.” — Sean Murphy, Nightforce
Gear Options for PRS Gas Guns
There are many buttstock options for ARs. For the PRS game, we like the Magpul PRS stock. This features a quick-adjustable cheek-piece and butt-plate — allowing you to easily adapt head position and LOP for your discipline of the day. (You may want a different LOP for prone shooting vs. bench shooting). The Magpul stock works well in a rear bag.
We recommend something like the Blackhawk grip which is more comfortable than the typical grips supplied by most black rifle makers. Up front, you’ll want a handguard with adaptability. Shown is a handguard with Picatinny rails on top and on both sides, affording lots of options. We might move one of the rails to the bottom, however, so it could be used for a bipod mount.
Add Your Favorite Premium Barrel:
PRS with a Gas Gun — Gavin Gear’s Experience
Thinking of trying out the Precision Rifle Series, starting off with a gas gun? Well Gavin Gear of UltimateReloader.com did just that, competing in his first-ever PRS match up in Washington State. With its timed stages (some just 90 seconds long), Gavin learned that PRS is about speed as well as accuracy. As a PRS newbie, Gavin found the competition fun but challenging. Gavin’s account of his experiences, set forth in two articles with accompanying videos, will help other novice PRS competitors prepare for PRS-type matches and assemble the right equipment.
This video has cool Aerial Drone footage, and in-depth explanation of stages:
Gavin enjoyed his first match: “Overall, the match was more fun and more laid back than I thought it would be. The guys in our squad were all really helpful, and even loaned me gear to try out when they noticed my gear wasn’t right for a particular shooting activity. One such case was when Ken Gustafson (of KYL Gear) offered to loan me one of the bags he had made. Below you can see me shooting off the infamous unstable tippy tank trap with a KYL Gear bag, and I’ll have to say [the bag] was amazing. It helped me lock down my rifle and get on target. What a great feeling!”
Gavin Gear of UltimateReloader.com has been testing the AutoTrickler V3, a microprocessor-controlled powder-dispensing system that works with super-precise force restoration scales. Combining an automated powder measure with a motorized trickler, the AutoTrickler can deliver a full powder charge, with single-kernel precision, in a few seconds.
AutoTrickler inventor Adam MacDonald has developed numerous enhancements to his powder-dispensing system, which will be incorporated into the latest AutoTrickler V3 production version. Gavin Gear reviews all these important new features in a new video released on October 6, 2019. Check it out:
Key Enhancements for AutoTrickler V3 Production Version:
1. Improved, Larger-Capacity Clear Powder Hopper
The new clear plastic powder hopper is much larger than the old Lee red-colored hopper it replaces. That’s good news for folks loading large magnum cartridges.
2. Taller Glass Powder Cup and Improved Diffuser
When the main powder charge comes down from the hopper, it passes through a plastic “diffuser” into a glass cup. Both these products have been enhanced.
3. New Simple V-Shaped Stop for Powder Cup
With the V3, it is easier to center the powder cup on the scale unit. Gavin explains: “Instead of a ramp and ‘landing pad’, the cup stop is now a super-simple angled back stop. If you push the cup back towards the center of the pan, it will guide itself into the centered position every time.”
Here is the original AutoTrickler V3 Video Report from UltimateReloader.com:
RCBS has introduced a new series of MatchMaster Competition Dies. These are available in Full-Length Sizing, Neck Sizing, and Seating configurations. These new MatchMaster dies are notable for four features:
1. The Competition Seating Die has a “view-port” for the bullet.
2. The Competition Seating Die features a free-floating, self-centering bullet-seating stem.
3. Expanders are titanium-nitride coated for reduced friction. Both the Neck-Sizing and FL-Sizing dies come with TiN expanders for smoother case extraction and reduced brass build-up on the expander.
4. RCBS is offering its own precision-machined Neck Bushings.
No More Mashed Fingers When Seating Bullets
RCBS notes: “Reloaders will love that they can end smashed fingers and misaligned bullets with the specially-designed bullet window [on the Seating Die]. And users can fine-tune any load … with the micrometer-adjustable, free-floating, self-centering bullet seating stem.”
RCBS Product Manager Will Hemeyer explained that the new Competition Seater is a game-changer. “What sets the MatchMaster Seating Die apart from the competition is a bullet-seating window with bullet-retaining system. Simply place the bullet in the window and raise the case into the die to seat the bullet. Couple this with a micrometer-adjustable, free-floating, self-centering bullet-seating stem and the MatchMaster Seating Die is easily the most accurate bullet seating die on the market.”
Why Use Expander with Bushing Dies?
Some viewers of Gavin’s video asked if an expander is superfluous when using neck-bushing dies. The answer is “it depends”. The bushings reduce neck diameter from the OUTSIDE. The expander should make the INSIDE of the neck perfectly round. Some hand-loaders prefer to take the necks down a couple thousandths below final loading diameter, then finish the job with an expander. That ensures the INSIDE of the case neck is perfectly concentric. This can be particularly useful for brass that has somewhat inconsistent neck-wall thickness. Bottom line, you can run these dies without expanders if you want, but that option is available. The expander is also removable so the assembly can be used for de-capping only.
MactchMaster Neck-Sizing Only Die
The MatchMaster Neck Sizing Die Set also uses RCBS neck bushings to control neck tension while not changing the body dimensions of fired cases. Frankly we strongly recommend that you full-length size your rifle rounds, but we acknowledge that some hand-loaders prefer to neck size for some applications. The MatchMaster Neck Sizing Dies do include a titanium-nitride coated expander, just like the FL-sizing MatchMaster dies.
Imagine if a man was asked to leave a restaurant for wearing a Gay Pride shirt. Or if a women was refused service because she was wearing a headband with a #MeToo message. The mainstream media would be in a frenzy. The incident would make national news. Liberal politicians would be holding angry press conferences, and CNN talking heads would be loudly demanding new legislation.
But guess what, there is another kind of discrimination in our society, a form of intolerance that the mainstream media actually emboldens — hatred towards gun owners. Intolerance towards those who support the Second Amendment — even those who have served their country in uniform.
Recently in Maui, HI, a restaurant manager demanded that disabled Vietnam veteran Jimmy Barber and his wife leave the establishment solely because Jimmy was wearing a shirt that said “Ultimate Reloader” and included a logo with the outline of a cartridge between the letters U and R.
Jimmy Barber served in Vietnam as a Navy Seabee “in-country” from 1970-71. He now suffers from heart disease because of exposure to agent orange. And the Maui eatery demanded that he (and his wife) leave the premises simply because his shirt said “Ultimate Reloader”. That’s despicable.
Isn’t it ironic that this intolerance occurred in Hawaii? Were it not for the sacrifice of American service men and women in the Pacific during WWII there is a good chance that the Hawaiian islands would no longer be part of the United States.
In a letter to Gavin Gear of UltimateReloader.com, Jimmy revealed: “My wife and I are in Maui. We were asked to leave a restaurant because I was wearing one of your t-shirts. I did not make a scene and I was very proud to leave.” Jimmy, by the way, is a dedicated pistol and rifle shooter who reloads a dozen cartridge types.
After learning of this incident, Gavin Gear contacted Starline Brass. Starline has decided to send Jimmy 250 new brass cases — just a way of saying “thanks” to Jimmy for his service to his country.
How to Stand Up for Your Rights
We all need to do our part to preserve our gun rights. Gavin Gear has collaborated with The Gun Collective on YouTube to explain what we can do to preserve our gun rights. Gavin states: “I do appreciate everyone out there in the gun community that is fighting for our rights. We need to stand together! And thanks Jimmy for ‘representing’ Ultimate Reloader!”
The NEW AutoTrickler V3 features an all-new motorized powder dispenser, an updated AutoTrickler base, and mobile APP control via Bluetooth.
If you want to throw powder with single-kernel precision, the AutoTrickler is perhaps the most advanced and efficient system you can buy. And now Adam MacDonald’s AutoTrickler is better than ever, with the release of the third generation AutoTrickler V3. This new AutoTrickler V3 has many major hardware enhancements, plus integrated software that lets you control all operations with your mobile device.
How fast does it work? CLICK HERE to visit the AutoTrickler website and watch the embedded video. You can see a 47.50 grain charge thrown and weighed in under 16 seconds.
Once you place the empty cup on the scale, the AutoThrow will automatically cycle to drop the bulk charge, and then the AutoTrickler ramps down to finish precisely within +/- 0.02 grains (about one kernel) of your target weight. The device’s inventor says: “With a little practice and fine tuning, you can expect to charge 50 cases to the kernel in less than 15 minutes.”
New Powder Thrower Increases Speed and Uniformity
The big hardware upgrade with the AutoTrickler V3 is the motorized powder dispenser. The V3 AutoThrow has been completely re-engineered with motorized operation in mind. Instead of modifying an off-the-shelf powder measure, the AutoTrickler V3 employs an original CNC-machined motorized thrower that cycles smoothly with a wider variety of powders.
Ball bearings hold the rotating aluminum drum against a nylon and rubber seal which ensures that fine powders like CFE223 will not leak internally and no manual adjustments are needed. The V3 AutoThrow will reliably providing a bulk starting charge within 0.1 grains for the AutoTrickler to finish to the kernel.
Software Functionality — APP Control via BlueTooth
With any smartphone or tablet supporting Bluetooth 4.0, you can set your target charge weight, increment the target on the fly, or manually operate the motors for easier setup and cleaning. The FREE AutoTrickler V3 APPS for iOS and Android will soon be available on the Apple App store and Google Play store.
Our friend Gavin Gear of UlimateReloader.com recently visited a SilencerCo dealer in the state of Washington, The Range LLC in Yakima, WA. Gavin was able to test a number of suppressors (aka “moderators” or “silencers”) for both rifle and pistols. Gavin recently released a lengthy article covering his experiences. If you are in the market for a suppressor, we highly recommend you read Gavin’s SilencerCo Products Overview on UltimateReloader.com.
Gavin was able to test three SilencerCo suppressors: the Omega 300, the Hybrid, and the Osprey 45. In addition Gavin was able to handle the Maxim 9, an integrally suppressed 9mm handgun.
Gavin reports the Omega 300, which is rated up to .300 Winchester Magnum, is a very popular “can”. According to Gavin, the Omega 300 has become the best-selling rifle suppressor in history for important reasons. First, it has an integral muzzle brake. Second, it can work for multiple calibers, from .223 up to .308. Third, “It is very tough — .300 Win Mag rated, and full-auto rated”.
SilencerCo lineup, from left: Omega 300, Hybrid, Osprey 45
Gavin says the Hybrid Suppressor is an interesting concept: “One suppressor that you can configure for multiple calibers, both rifle and pistol. This includes the ability to change out the threaded mount on the muzzle end, and you can also swap out end caps that will optimize sound suppression for different calibers. The Hybrid… is full-auto rated, and can handle rifle cartridges up to and including .338 Lapua Magnum! But this suppressor can also be used for pistol applications…from 9mm up to 44 ACP.”
When is a single-stage reloading press worth close to a thousand bucks? When it’s made in Germany with CNC technology and crafted to aero-space precision standards. UltimateReloader.com’s Gavin Gear recently got his hands on a Turban 120mm Heavy Präzipress. This unit retails for 850 Euros (850,00 €), about $960 at current exchange rates. Gavin put the Präzipress through its paces, and came away VERY impressed. READ FULL REVIEW HERE.
Impressive Test Results
Sizing once-fired 6.5mm Creedmoor cases with the Präzipress, Gavin achieved great results for shoulder “bump” consistency. The sizing results were nothing short of spectacular. After zeroing the first of ten cases, the remaining nine were essentially identical, showing as “0.000”, meaning less than half a thousandth of variation.
The Präzipress also delivered ultra-low run-out when seating bullets using a Forster die. On all ten test cases, the run-out was +/- 0.001″ (one-thousandth) or less.
Is this kind of press worth the money? Gavin says “yes” if you demand the highest level of precision in sizing and seating: “When you use this press, it’s immediately clear that there are no details neglected, and I can’t imagine one of these presses ever wearing out. Based on the precision tests I did with ammunition loading, it’s clear that this level of precision DOES make a difference for ammunition dimensions and consistency.”
According to Gavin, the “Heavy” 120mm version of the Präzipress is massive and boasts many notable design features:
— Three guide rods with linear roller guides (I have not seen these on any other press)
— Ambidextrous operation (handle can be mounted on left or right side)
— Positive snap shellholder retainer (secure, but easy to insert/remove shellholder)
— 120mm opening accepts cartridges up to .338 Lapua Magnum length
— Enclosed spent primer catch system which contains debris
— Optimized leverage (VERY powerful mechanical advantage for sizing)
— Oversized handle (bar diameter) that minimizes flex
The .224 Valkyrie is the “trendy” cartridge now for AR shooters looking for better long-range performance than the standard .223 Rem (5.56×45) can provide. With the right bullets and load, the .224 Valkyrie offers significantly less drop and drift at long range. The .224 Valkyrie is basically a 6.8 SPC case necked down to .22-caliber. You can use your existing AR15 lower, but you will need a dedicated .224 Valkyrie upper, or at the minimum a new barrel, modified bolt with proper bolt face, and 6.8-compliant mags.
Valkyrie fans say this efficient cartridge offers performance rivaling a 22-250 in a smaller case. The Social Regressive YouTube channel explains: “There are two key reasons why the 224 Valkyrie is unique and desirable. First, it is specifically designed to fit the limitations of the AR-15 platform. It does so even when loaded with gigantic bullets, like the 90-grain SMK that Federal announced. The .22-250 Rem is too long and too fat to work in the AR-15 platform; it needs an AR-10 bolt and magazine.”
Valkyrie Video Fest — Five Informative Videos
Here are five videos featuring the .224 Valkyrie cartridge and rifle options. We think the two applications that make most sense for this new cartridge are: 1) PRS Gas Gun matches (Open Class) — you get 6.5 Creedmoor ballistic performance with much less recoil for faster shot transitions; and 2) Long-Range (400+ yards) varminting — you get performance similar to a 22-250 in a cartridge that works with your existing AR15 lower. That will really help with those long shots on P-dogs.
In this video Gavin Gear test the .224 Valkyrie cartridge in both AR and bolt-action rifles. Using a drone to capture images of shots on target, Gavin produces some impressively small groups at 600 yards. This shows that the .224 Valkyrie has serious accuracy potential when the load is right.
In this 37-minute video on the “IraqVeteran8888″ channel, Chad tests a .224 Valkyrie rifle with various ammo, including 90gr handloads. The test addresses the pros and cons of this new cartridge, explaining the need to have realistic expectations, and a barrel with twist rate suitable for your bullet choices. This is a long video, but worth watching if you are contemplating building or buying a .224 Valkyrie.
This follow-up IraqVet888 video focuses on reloading for the .224 Valkyrie. Chad addresses a multitude of issues including: powder selection, bullet options, brass longevity and primer pocket uniforming. If you own a .224 Valkyrie and hand-load for the rifle, you should watch this video.
Here Gavin Gear tests Starline’s new .224 Valkyrie brass, seeing how well it stands up to repeated firings. Gavin checked for primer pocket stretching and found that 50% of the cases went 8 or more firings before the primer pockets grew too much. However a few cases did need to be retired after four firings. Gavin notes: “Brass longevity is one of the key considerations for loading 224 Valkyrie, so I thought I would put my Starline 224 Valkyrie cases to the test! Be sure to read the full Brass Test article for more insights.
The .224 Valkyrie has been marketed as a low-recoil round that can stay supersonic to 1300 yards and beyond (with 90gr Sierra MatchKings). Here a Sniper’s Hide duo shots an AR-platform .224 Valkyrie at distances out to 1550+ yards. To be honest, the accuracy wasn’t that impressive. However this test confirms that the .224 Valkyrie does launch the long, heavy projectiles at high enough velocities to prove superior to the standard .223 Rem. Frank Galli (aka “Lowlight”) teams up with Brian Whalen of Colorado Precision Rifle at the Blue Steel Ranch in New Mexico.
Progressive reloading presses offer shooters speed and efficiency in producing custom-tailored rifle and pistol ammunition. However, there is a wide choice of Progressive Presses and a bewildering array of options to consider. In this video, the 6.5 Guys and UltimateReloader.com’s Gavin Gear provide an overview of the leading Progressive Presses on the market along with key considerations for precision rifle shooters. If you are considering getting a Progessive for rifle ammo reloading, you should watch this informative, 25-minute video.
10 Tips for Reloading Precision Rifle Ammo on a Progressive Press:
1. Make sure the brass is very clean. Don’t mix old range pick-up brass with newer brass.
2. Apply a thin, spray lube to all cases before the sizing/loading cycle.
3. Consider priming your brass separately (with a hand or bench tool) before the operation. Then inspect the primers before loading powder and bullets.
4. Always wear eye protection when loading with the Progressive, particularly if you are priming cases.
5. With tape, mark the powder measure/dropper with the powder type and charge weight.
6. Cycle a few cases, sizing and adding powder but NOT seating bullets. Weigh the powder charges to ensure the powder measure is dispensing the correct charge. Sometimes this will change a couple tenths as it “settles down” after the first few charges.
7. Check the brass for shoulder bump and bullet seating depth carefully for the first few rounds, then check again periodically.
8. Try to maintain a steady pace and operate the handle the same way every time.
9. Visually inspect the powder charge in each case (before bullet seating), and use a lock-out die if your Progressive Press has enough stations.
10. Never, ever mix pistol and rifle powders! If you have previously loaded pistol ammo with your Progressive, make sure ALL the powder (every flake and kernel) is removed from all components of the powder-dropping system before you add rifle powder.
Loading Pistol Ammo on a Dillon
The .45 ACP is probably our favorite centerfire pistol cartridge. In this video, Gavin Gear shows how to load this popular round on a Dillon 550B Progressive Press:
Visit these sites for more Reloading and Precision Shooting Videos:
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:
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:
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.
Impressive Test Results
