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Old 09-30-2010, 02:14 PM  Geek is offline     #1 (permalink)
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Default New round 300 AAC Blackout 7.62x35

I just found out about a new cartridge (thanks http://www.thearmorygroup.com/) that Advanced Armament Corporation has produced. The 300 AAC BLACKOUT (300BLK) is a .30 cal round that's 3mm shorter than the standard 7.62x39 Soviet round. Now, I'm not sure why they chose to do this. Obviously it's going to have more kinetic energy than the 5.56 but at 16mm shorter than the 7.62x51 NATO (.308 WIN) I doubt it'll be very accurate past 200 or 300 yards.

Anyway, here are three sites about the new round. Militarytimes and AACblackout both have some pretty nice photos. Definitely check them out





Advanced Armament Corp. is proud to introduce the 300 AAC BLACKOUT (300BLK). This system was developed to launch 30 caliber projectiles from the AR platform without a reduction in magazine capacity and compatible with the standard bolt. Initially a complete 9″ PDW upper will be offered as well as a complete barrel assembly, and 3 types of 300BLK ammo.

Full power 123 grain ammunition matches the ballistics of the 7.62x39mm AK, has 37% more energy than 5.56mm M855, and 9% more than 6.8 SPC TAP 110. In fact, from a 9 inch barrel, the 300BLK has more muzzle energy than 5.56mm M855 from a 16 inch barrel. When 300 BLK is used in a 16 inch barrel, it has 23% more energy than 5.56mm M855 from a 16 inch barrel – with much higher-mass projectiles for a more dramatic effect on the target. Or choose subsonic cartridges for optimal use with a sound suppressor – 220 grain Sierra OTM (open-tip match) bullets vastly outperforms a 9mm MP5-SD in penetration and long range accuracy.

Advanced Armament Corp. Introducing the 300BLK





~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~




Military Times Gear Scout ? 300 AAC BLACKOUT ? New caliber brings 7.62 punch to AR platform

Calibers come and go, but not usually from companies that are tied into military contracts. With the M4 replacement testing coming up in the near future, we weren’t surprised when we got a call from AAC/ Remington telling us about a new project. What we didn’t see coming was that sneak peaks would be done at Modern Day Marine. Luckily, we were on hand as Marines in the know petted and panted over the pumped up SBR.

As interesting as a new caliber is to some of us, it gets better. Start thinking about a M4 with a 9″ barrel that matches the energy of 5.56mm M855 from a 16″ barrel (the standard M4 is a 14.5″). The 300 AAC BLACKOUT 123 grain ammunition matches the ballistics of the 7.62x39mm AK and has 37% more energy than 5.56mm M855 when either are fired through a short barrel. Clearing buildings, crawl spaces, vehicle work, going up ladders and seizing ships or aircraft are all tasks that have us wanting a short barrel, but getting shot at has us wanting a round that ends threats quickly. It looks like the new 300 AAC Blackout from Remington/ AAC ammunition and upper receiver is at the right place at the right time.

Click on the picture for loads more information, and of course, lots more pictures.



We spoke with Robert Silvers who is the Research and Development Director for Advanced Armament Corp. Mr. Silvers explained that they had developed not only a caliber, but also an upper receiver group that would drop on existing M4 carbines (or AR15s). This upper receiver group uses a standard M4 bolt and Bolt Carrier Group (BCG). We pointed out that this allowed for an immediate swap for Military or Law Enforcement teams that were already using the M4 as all they would need would be for their armorers to change out barrels. I don’t think my observation was anything new, and he agreed. He went on to state there were three types of SAAMI approved ammunition immediately available with additional options coming up in the near future.

Current ammunition types are the 123 gr. MC 300BLK, 155 gr. OTM 300BLK, and 220 gr. SUBSONIC OTM 300BLK. Each round is purpose driven, and allows selection for a given mission. The supersonic ammunition was developed as a 5.56 replacement, while the heavier subsonic ammo was designed to give a total weapon replacement option for users of the MP5 and MP7. Barrier Blind Optimal Penetration ammo is currently under development.

One weapon and caliber replacing the standard M4, AND the more specialized HK MP-5 and HK MP-7A1? It sounds like a congressman or city managers prayers have been answered, never mind unit armorer and supply guys. Money issues aside, training with one weapon platform makes more sense than jumping back and forth. Of course we use the best tools available for the job, but sometimes less is more.

Advanced Armament Corp is best known for their suppressors, and it makes sense that along with the development of the upper and ammunition, a silencer would be included. The numbers given to us show the new 762-SDN-6 suppressor is shooting a 220 grain 300BLK bullet at 1000FPS at 126.2 dB. The MP5-SD is firing a 115 grain bullet at 900FPS at 130dB with its HK suppressor. I understand that these numbers were not done at the same time, and that various testing methods can show different results, so I look at these as rough numbers. Anyone who had fired a suppressed MP5 knows how quiet they are, so even as a ballpark figure, these numbers are impressive.

Below are the listed design objectives as they were given. When I asked who had come to AAC/ Remington with these design objectives, I was met with a moment of silence, and told it just came as part of a project. Fair enough.

DESIGN OBJECTIVES

• Create a reliable compact 30-cal solution for the AR platform
• Utilize existing inventory magazines while retaining their full capacity
• Create the optimal platform for sound and flash suppressed fire
• Create compatible supersonic ammo that matches 7.62×39 ballistics
• Provide the ability to penetrate barriers with high-mass projectiles
• Provide all capabilities in a lightweight, durable, low recoiling package

Mr. Silvers pointed out several times that this was not a caliber that was exclusive to the Military or Law Enforcement market. His stated his goal was to be able to deliver a reliable source of ammunition through Remington, and to make the 300 AAC Blackout something affordable for target shooters and hunters. There are a lot of AR15 shooters in this country, and a lot of hunters, but most states will not allow hunting with a .22 caliber. The advent of the 300 AAC Blackout may bring interest from a few other avenues as news of this circulates throughout the shooting community. While 6.8SPC is an option, there many people who will like the ability to use their current AR15 magazines, as well as using a standard 5.56 bolt. Ammunition reloaders may find their .30 favorite bullets another reason to look at the 300 AAC Blackout.

There is a lot more information that we have on this weapon system, but we have one in hand, and ammunition enroute to us. We are going to put the weapon and rounds in the hands of MIL and LE trigger pullers, then report back with our findings. For now, check out the new website and start soaking it all up.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

300 AAC BLACKOUT (300BLK)

Introducing the Advanced Armament Corp. 300 AAC BLACKOUT (300BLK). This system was developed to launch 30 caliber projectiles from the AR platform without a reduction in magazine capacity and compatible with the standard bolt. Full power 123 grain ammunition matches the ballistics of the 7.62x39mm AK, has 37% more energy than 5.56mm M855, and 9% more than 6.8 SPC TAP 110. In fact, from a 9 inch barrel, the 300BLK has more muzzle energy than 5.56mm M855 from a 16 inch barrel. When 300 BLK is used in a 16 inch barrel, it has 23% more energy than 5.56mm M855 from a 16 inch barrel - with much higher-mass projectiles for a more dramatic effect on the target. Or choose subsonic cartridges for optimal use with a sound suppressor - 220 grain Sierra OTM (open-tip match) bullets vastly outperforms a 9mm MP5-SD in penetration and long range accuracy. Due to the high efficiency of the cartridge, less powder is used than 5.56mm, which results in a rifle that is a comfortable to shoot - even with a short barrel.

CARTRIDGE


DESIGN OBJECTIVES
• Create a reliable compact 30-cal solution for the AR platform
• Utilize existing inventory magazines while retaining their full capacity
• Create the optimal platform for sound and flash suppressed fire
• Create compatible supersonic ammo that matches 7.62x39 ballistics
• Provide the ability to penetrate barriers with high-mass projectiles
• Provide all capabilities in a lightweight, durable, low recoiling package

REASONS 7.62x39 wAS NOT CONSIDERED
Extreme cartridge taper
• Reduces reliability of feeding in AR Magazines
• Reduces Magazine capacity
• Cartridge taper induces considerably higher bolt thrust-
exacerbating the AR Bolt's weaknesses
• Requires a larger Bolt Face which reduces Bolt Locking Lug strength-
exacerbating the AR Bolt's weaknesses
Limited projectile selection
• 0.311" diameter not a common option in most modern bullets

 
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Old 09-30-2010, 09:56 PM  Geek is offline     #2 (permalink)
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So, what do ya think?
 
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Old 10-01-2010, 09:24 AM  Geek is offline     #3 (permalink)
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Seriously? nothing? :P
 
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Old 10-01-2010, 09:13 PM  phatdoughnut is offline     #4 (permalink)
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Looks like just another ar to me. Ak in this? yes please.
 
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Old 10-21-2010, 10:34 PM  82nd airborne is offline     #5 (permalink)
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Point em to the other thread!
 
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Old 10-21-2010, 10:52 PM  frankgon4 is offline     #6 (permalink)
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Lot of bullets produce more energy than the 5.56
Need more information than this to comment. What is the round weight compared to 5.56, distance of useable accuracy, etc.
I am open to keeping an eye on the testing results.
 
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Old 10-21-2010, 11:51 PM  Geek is offline     #7 (permalink)
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The more I read about it, the more I like it. I hear it has similar stats as the 7.62x39 but at subsonic it's far quieter in suppressed applications. In supersonic its effective range is increased. What that is increased to, who knows.

82nd Airborne is the Co-owner of Delta Company Arms, LLC, a company making barrels for this round.

Delta Company Arms .300 BLK AR-15 and barrels
 
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Old 10-24-2010, 11:05 AM  Colt45 is offline     #8 (permalink)
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If the US Military is going away from 5.56, the 6mm-6.5mm is a much better choice, just my $0.02 worth.

edit: check this out

6x45 mm
From Wikipedia, the free encyclopedia (Redirected from 6 mm/223)
Jump to: navigation, search
6x45mm
Type Rifle, Handgun
Place of origin USA
Production history
Designed 1965
Specifications
Parent case .223 Remington
Case type Rimless, bottleneck
Bullet diameter 0.243 (6 mm)
Neck diameter 0.272 in (6.9 mm)
Shoulder diameter 0.354 in (9.0 mm)
Base diameter 0.377 in (9.6 mm)
Rim diameter 0.378 in (9.6 mm)
Rim thickness 0.045 in (1.1 mm)
Case length 1.76 in (45 mm)
Case capacity 26.9 gr H2O (1.749 cm³)
Primer type Small rifle
Ballistic performance
Bullet weight/type Velocity Energy
75 gr (4.9 g) SP 2,700 ft/s (820 m/s) 1,214 ft·lbf (1,646 J)
80 gr (5.2 g) SP 2,650 ft/s (810 m/s) 1,248 ft·lbf (1,692 J)
90 gr (5.8 g) SP 2,540 ft/s (770 m/s) 1,300 ft·lbf (1,800 J)
100 gr (6.5 g) SP 2,400 ft/s (730 m/s) 1,279 ft·lbf (1,734 J)

The 6x45mm is a now considered obsolete, rimless, bottlenecked cartridge based on the .223 Remington or 5.56 NATO cartridge necked up to .243 (6mm). The cartridge is also known as the 6mm-233 Remington or 6mm/223.

Contents [hide]
1 History
2 General Information
3 Performance
4 Cartridge Specifications
5 Hunting Applications
6 Platform Availability
7 See also
8 References

[edit] History
Soon after the release of the .223 Remington as a commercial cartridge, shooters began experimenting with the cartridge in an attempt to improve its performance.[1] Several of these experimenters necked up the .223 Remington to 6mm as the .24 (6.1 mm) caliber bullets provided better external ballistic performance over .22 (5.7 mm) caliber bullets. While several variation existed between early versions of these cartridges, the 6x45mm as we know it today became the standard version of the cartridge which is simply a necked up version of the .223 Remington without any further modifications or improvements made to it.

[edit] General Information
The cartridge’s inherent accuracy was a carry over from the .222 Remington which already had a loyal following in benchrest shooting fraternity.[2] Benchrest shooters soon took notice of the cartridge and began building custom rifles chambered for the cartridge. As a testament to the 6x45mm’s accuracy, Jim Stekl, who at that time managed Remington’s custom shop and developer of the .22 BR cartridge, scored an aggregate record of .3069 inches (7.80 mm) in the 1973 IBS 200 yard Sporter category. However, its use in competitive shooting waned with the arrival of the 6mm BR and 6mm PPC cartridges on the benchrest shooting scene.[3]

The advantage of the 6x45mm over the .223 Remington is that it is capable of being loaded heavier bullets with better ballistic coefficient ratings than its parent cartridge, the .223 Remington. This results in a flatter trajectory, less susceptible to wind drift and better energy retention characteristics.

The cartridge is extremely efficient with its small powder charge. This translated to excellent barrel life. The cartridge has a very low recoil and muzzle blast which make it a pleasant cartridge to shoot.

Since the cartridge was never commercially adopted by an ammunition manufacturer it has remained a wildcat cartridge since it inception. However, making cases from existing .223 Remington brass is simple as running the case through a 6x45mm die. The availability of .223 cases, the ease of forming, and the light power charge make for a very affordable shooting cartridge.

[edit] Performance
The advantage of the 6x45 mm over the .223 Remington is that it is capable of being loaded heavier bullets with better ballistic coefficient ratings than its parent cartridge, the .223 Remington. This results in a flatter trajectory (with bullets of similar weight), less susceptibility to wind drift and better energy retention characteristics.

Cartridge Criteria Muzzle 50 yd (46 m) 100 yd (91 m) 150 yd (140 m) 200 yd (180 m) 300 yd (270 m)
.223 Remington 55 grains (3.6 g) Sierra FMJ-BT[4] Velocity 3,300 ft/s (1,000 m/s) 3,110 ft/s (950 m/s) 2,929 ft/s (893 m/s) 2,754 ft/s (839 m/s) 2,587 ft/s (789 m/s) 2,269 ft/s (692 m/s)
Energy 1,330 ft·lbf (1,800 J) 1,181 ft·lbf (1,601 J) 1,047 ft·lbf (1,420 J) 926 ft·lbf (1,255 J) 817 ft·lbf (1,108 J) 629 ft·lbf (853 J)
6x45mm 90 grains (5.8 g) Sierra FMJ-BT[3] Velocity 2,700 ft/s (820 m/s) 2,580 ft/s (790 m/s) 2,462 ft/s (750 m/s) 2,348 ft/s (716 m/s) 2,237 ft/s (682 m/s) 2,023 ft/s (617 m/s)
Energy 1,457 ft·lbf (1,975 J) 1,330 ft·lbf (1,800 J) 1,212 ft·lbf (1,643 J) 1,102 ft·lbf (1,494 J) 1,000 ft·lbf (1,400 J) 818 ft·lbf (1,109 J)
Values courtesy of the Hornady Ballistic Calculator[5]

[edit] Cartridge Specifications
The 6x45 mm is a wildcat cartridge and has not been standardized by any agency nor has it been offered a a proprietary cartridge by any ammunition manufacturer. Some specialty rifle makers such as those that sell varmint rifles offer rifles chambered in this cartridge.[6] Specifications for the cartridge are derived from the necked up parent cartridge without further improvement.



The cartridge maximum overall length is nominally given as 2.230-inch (56.6 mm), however, as the cartridge is a wildcat cartridge chamber dimensions may vary from manufacturer to manufacturer. For this reason overall length of the cartridge may vary.

[edit] Hunting Applications
Many countries and U.S. states require a minimum of .24 caliber (6.1 mm) for hunting certain game species. In such countries and states the 6x45mm would be legal for hunting as long as no further requirement regarding power, energy, or case length is stipulated. However, it should be considered a marginal cartridge for these game species at best.[7]

The cartridge gained a following in South Africa where it was used to hunt small antelope and gazelle species such as duiker, impala, klipspringer, springbok and the Thompson’s gazelles. In North America it is capable of taking small predator species such as bobcats, coyotes and foxes. In Europe, it can be used for small goat and deer species such as the roe deer and chamois where legally permitted.

An improved version of the cartridge called the 6mm TCU was developed for metallic silhouette shooting. While the cartridges are quite similar they are not interchangeable.[8]

[edit] Platform Availability
The AR-15/M-16 can easily be converted to the 6x45mm with a simple barrel swap with little or no further modifications to the rifle. This is also true for rifles such as Ruger’s Mini 14 and most bolt action rifles chambered for the .223 Remington cartridge.[1] The 6x45mm cartridge provides better down range performance than the .223 Remington or the 5.56 NATO cartridges. The cartridge had been offered by Cooper Arms, Kimber and a few other rifle manufacturers in their rifles as a regular factory chambering for a period of time.[3]

However, the cartridge’s break through was in the area of handgun hunting where it became very popular. The Remington XP-100 and the T/C handgun were chambered for the cartridge.[1] It provided a flat shooting cartridge capable of taking small deer and small game species


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Last edited by Colt45; 10-24-2010 at 11:10 AM.
 
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