Updating this thread:

 

Received 2 brand new boxes of ammo free of charge for the inconvenience straight from Remington's ammo plant. The rounds came after I spoke in-length with the Director of QC.

 

Clearing up some other issues:

Yes, it chambered, and the bolt seated enough to get a click out of the trigger. The primer on the .223 round did not have a dimple however. The reason I did not include it in the original post is because I have this thread cross-posted on multiple forums and didn't want the "OMG you could of died/your retarded" being the majority of the replies. I wanted to keep it focused on the issue of .223 rounds mixed in with that lot number.

 

Since I don't mind thread jacking my own thread - 300Blk IMHO is the most promising cartridge to be released in the AR platform since .308. The benefits are many for the 300Blk, once you understand what the round can and cannot do.

 

Please explain what it can and cannot do.

Isn't the only true advantage of this round, one that we can't take advantage of, is that it was designed from the ground up to run with a suppressor? If you take the suppressor aspect out of the equation, there are many other more efficient rounds. This one is just an underpowered .30. JMHO.

 

Adios,

 

Pizza Bob

I agree it's almost like you can shoot .40sw in a 10 mm barrel

 

Ahhhh, no. It's nothing like that. The 10 mm and .40 S&W both use the same diameter bullet. In fact the .40 S&W is just a derivative of the 10 mm (shorter case).

 

The .300Blk uses a .308 diameter bullet and the 5.56 uses a .223 diameter bullet. Your analogy would have been better phrased using .40 and 9 mm as your examples.

 

Adios,

 

Pizza Bob

Please explain what it can and cannot do.

 

Isn't the only true advantage of this round, one that we can't take advantage of, is that it was designed from the ground up to run with a suppressor? If you take the suppressor aspect out of the equation, there are many other more efficient rounds. This one is just an underpowered .30. JMHO.

 

Two birds - one stone

 

The 300Blk was not originally designed to be used with a supressor, it did however turn out to be a huge benefit when firing 220gr projectiles - but I will get back to that. It was designed to be able to fire a .30 cal projectile out of a standard AR-15, using the same bolt, BCG, magazines, buffer, buffer spring, etc., with the only requirement being a barrel change. This allows a lightweight platform to fire a 115-147gr .308 bullet, out of the most standard weapon in use by law enforcement and the military (with a huge amount of civilian shooter with AR15s as well).

 

Suppresion/subsonic is just a benefit of the round design. I've shot subsonics through my Blackout Upper and it sounds a hair louder than a .22, and it's pushing a 220 grain projectile. So don't get to hung up on not having a suppressor, as even the super sonic rounds are pretty quiet compared to their .308 counterparts,

 

Some of the hot topics about 300 Blackout:

"300 AAC Blackout has as much energy from a 16 inch barrel as 5.56mm from a 24 inch barrel. You get 8 inches of barrel for free."

 

"300 AAC BLACKOUT, due to the larger bore than 223, is very efficient in shorter barrels, and we have had good functioning results with AR barrels down to 6.2 inches."

 

"300 AAC Blackout has a little less energy at the muzzle(than 7.62x39), but due to higher BC bullets, it is equal by around 110 meters, and by 300 meters, the Remington 125 grain Match ammo has 16.7% more energy than even the hot Lapua 7.62x39mm ammo."

 

Regarding accuracy, I can shoot right around 1 MOA out of my upper at 100 yards off a bench, so it's definitely combat accurate.

Potency, it's a landslide. IMHO, there is no better round ballistically inside 250 yards for all purpose defensive use. The 147gr carry a metric ton of energy downrange, and it was rated combat effective to 410m out of a 9" barrel by the military. The new Barnes bullet apparently is pretty devastating as well.

 

Recoil impulse is less than a 5.56, and this was confirmed with 2 others who shot my 5.56 and 300Blk uppers back to back.

 

Light as you can make your AR, so no added bulk like you get with a 6.8 or .308 AR platform.

 

30k round estimated barrel life, due to the relatively low PSI of the catridge.

 

Out of a 9" barrel, you're getting a 125-147gr projectile at 2,000 ft/s, with 1,100 ft-lbs at the Muzzle. That's roughly 25% more than 5.56 M855 out of a 9" barrel.

 

 

Regarding reliability - the system has to be run wet. At leasts that's been my experience. I can shoot both super and subs through my AAC 16" barrel without issue. I originally had trouble short stroking with subs - but once I swapped to a standard carbine buffer I was good to go.

 

 

If you can't tell I really like the round. That's it for now because my daughter is crying and I have to go see what's up.

The 300 blackout is nearly identical to the 300 whisper developed by jdj. It was most definitely designed to be a suppressed cartridge. It was also designed to perform on par with the .30-30 cartridge, but out of an ar, and with bullets that were ballistically superior.

 

Look at the cartridge specs. Anyone telling you the .300 blackout was an original design with different design goals is full of it.

Show me an original design in the last 75 years! Just about everything is based off of something that came before it including the whisper.The 300 whisper was NOT designed to be suppressed. Suppression was one of its design elements but it was not the driving factor. Knowing JDJones, Im sure hunting was a primary consideration. It is not based off of the 5.56 case, although very close, it is not the same. Where the whisper falls short IMO is the need for a different bolt in the AR platform. The 300 Blk uses a standard bolt.

The 300 blackout is nearly identical to the 300 whisper developed by jdj. - True in that they had proven the concept. 300 Whisper = wildcat. 300Blk = SAAMI spec - It was most definitely designed to be a suppressed cartridge - Sound and flash suppresion was one of the 6 project objective, the primary being to "create a reliable compact 30-cal solution for the AR platform" - . It was also designed to perform on par with the .30-30 cartridge, but out of an ar, and with bullets that were ballistically superior. - Agree -

 

Look at the cartridge specs. Anyone telling you the .300 blackout was an original design with different design goals is full of it. - No one is saying it was an original design -

 

It's not a round for the masses, but the SAAMI spec and the fact that it's been picked up by over 60 firearms & ammunition companies (barrels, reloading supplies, ammo, etc.) does make it an interesting choice. In NJ it's not as cut and dry, since the round excels out of short barreled rifles, and with suppression. That said my 16" shoots subsonic's with the report of a .22, and has almost no felt recoil for a .30 cal projectile.