That... is pretty sweet!
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My rifle is now complete........ 300 AAC Black Out
- Thread starter wwboater
- Start date
the #s don't quite match up. there's a price for sticky a fat bullet in a short case, not enuff room for powder. the velocity & energy #s for the commie 7.62 is still HIGHER than the 300.
a .30 cal in your AR15 that has better balistics than the 7.62X39. Evil sbr
What is the trajectory on the super sonic .300blk
from Wikipedia:
300 BLACK:
125 gr (8.1 g) OTM 2,215 ft/s (675 m/s) 1,360 ft·lbf (1,840 J)
220 gr (14 g) OTM 1,010 ft/s (310 m/s) 498 ft·lbf (675 J)
------------------------------------------
7.62 commie:
123 gr (8.0 g) 731.5 m/s (2,400 ft/s) 2,073.6 J (1,529.4 ft·lbf)
300 BLACK:
125 gr (8.1 g) OTM 2,215 ft/s (675 m/s) 1,360 ft·lbf (1,840 J)
220 gr (14 g) OTM 1,010 ft/s (310 m/s) 498 ft·lbf (675 J)
------------------------------------------
7.62 commie:
123 gr (8.0 g) 731.5 m/s (2,400 ft/s) 2,073.6 J (1,529.4 ft·lbf)
So the 300 Blk is 300 ft per sec slower..... BFD.
From the 300 BLK web site
Full power 115-125 grain ammunition matches the ballistics of the 7.62x39mm AK, and eclipses 5.56mm 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.
The AK sucks to suppress!!!!.
Sorry you don't like the round. I don't like Keltecs or Rock Islands... but thats just me. To each his own.
So what is the trajectory of BLK, how many inches of drop can one expect at 100 yrds, 200yrds, etc?????
Energy of 300blk is slightly better than 7.62x39 from a 9" and 16" barrel - depending on bullet weights. The 2 are very similar, but the 300 edges out in my book because of the platform it can be used with. Page 26
http://300aacblackout.com/resources/300-BLK.pdf
Last edited:
WHY
NOT
7.62x39mm?
7.62x39mm was eliminated from consideration
• Extreme Cartridge Taper
– Reduces reliability of feeding in AR Magazines
– Reduces Magazine capacity
– Exacerbates the AR Bolt’s weaknesses
• Cartridge taper induces considerably higher bolt thrust
• Requires a larger Bolt Face which reduces Bolt Locking Lug strength
• Limited Projectile Selection
– 0.311” not a common option in most modern bullets
WHY
7.62x35mm?
300 BLACKOUT (7.62x35mm) is better because:
• Standard 5.56mm Cartridge Taper
– AR Magazines were designed to feed this taper
– Maintains Magazine capacity
– Minimizes strain on AR Bolt’s weaknesses
• Cartridge taper maintains standard resistance to bolt thrust
• Utilizes a standard AR Bolt Face, to retain Bolt Locking Lug strength
• Wide Projectile Selection
– 0.308” possibly the most popular center fire rifle bullet in history
– Wide Projectile Selection
• Proven Track Record
– Pioneering work by JD Jones with the 300 Whisper®, and others with 300 Fireball and
300-221, have proven the concept.
NOT
7.62x39mm?
7.62x39mm was eliminated from consideration
• Extreme Cartridge Taper
– Reduces reliability of feeding in AR Magazines
– Reduces Magazine capacity
– Exacerbates the AR Bolt’s weaknesses
• Cartridge taper induces considerably higher bolt thrust
• Requires a larger Bolt Face which reduces Bolt Locking Lug strength
• Limited Projectile Selection
– 0.311” not a common option in most modern bullets
WHY
7.62x35mm?
300 BLACKOUT (7.62x35mm) is better because:
• Standard 5.56mm Cartridge Taper
– AR Magazines were designed to feed this taper
– Maintains Magazine capacity
– Minimizes strain on AR Bolt’s weaknesses
• Cartridge taper maintains standard resistance to bolt thrust
• Utilizes a standard AR Bolt Face, to retain Bolt Locking Lug strength
• Wide Projectile Selection
– 0.308” possibly the most popular center fire rifle bullet in history
– Wide Projectile Selection
• Proven Track Record
– Pioneering work by JD Jones with the 300 Whisper®, and others with 300 Fireball and
300-221, have proven the concept.
300 aac is a better route to go if you want ak performance out of an ar. Kudos to the developers! Just getting ready to build an upper and load a few thousand rounds. Will eventually get rid of most of my aks then. One platform with multiple options makes better sense from a training standpoint. Combine that with a glock 40 caliber with drop in conversion barrels and you have the ultimate shtf weapons systems!
