.300 blackout terminal ballistics

[t-bone6.8]

Remington $10.36 per box UMC ammunition has the following features that Hornady $22 a box 300 BLK does not have:

1. NATO-like brass hardness - more like 5.56mm than 223.
2. Sealed primers.
3. Cannelured bullets.
4. Custom bullet design which is optimal for 300 BLK feeding.

the similar quality target or match grade ammo is similarly priced, Why does cheap crap plinking ammo comparisons to 6.8 hunting ammo come into a 300 ballistics thread?

Drop the 6.8, I never brought it up - you did

[rsilvers]

the similar quality target or match grade ammo is similarly priced, Why does cheap crap plinking ammo comparisons to 6.8 hunting ammo come into a 300 ballistics thread?

Drop the 6.8, I never brought it up - you did

I was comparing to the very lowest priced 6.8 ammunition, not 6.8 hunting ammunition.

[t-bone6.8]

He gave an example of two loads which had velocities unattainable at 55,000 psi in a 16 inch barrel. That was a valid thing to point out.

my sincere aplologies, something happened on the copy/paste

[rsilvers]

I have not been editing links - at least not in the last few weeks.

[rsilvers]

http://300aacblackout.com/resources/...t06OCT2010.pdf

[t-bone6.8]

I have not been editing links - at least not in the last few weeks.

my sincere aplologies, something happened on the copy/paste

[DocGKR]

"Impact velocity is impact velocity."

You might want to speak with Buford--the different rotational velocity when using downloaded charges for close range testing can influence test results in some, but not all cases--we have particularly seen this with some specific 5.56 mm loads fired from SBR's.

[Nightvisionary]

From the 300 BK site -
Notes :
Weapon – 300 AAC BLACKOUT with 16" barrel length. Loads are at various levels of charge to simulate impacts down range
Distance – 10.0 feet, muzzle to impact face

While this may be a industry standard practice, it may not be "real world"

http://300aacblackout.com/resources/...t06OCT2010.pdf

There is reality and then there is the Blackout.

I don't think you read my post or your link carefully. In any case downrange impact velocity will never be 200 feet per second faster than muzzle velocity. Other than the Brassfetcher site I have never heard any source state the 300 Blackout muzzle velocity any where near 2500 feet per second from an AR with a 110 grain bullet.

[rsilvers]

different rotational velocity when using downloaded charges for close range testing can influence test results in some

True that RPM has an effect - and that is an argument for using very fast twist rates to improve terminal performance.

RPM does not decay much though.

[rsilvers]

Other than the Brassfetcher site I have never heard any source state the 300 Blackout muzzle velocity any where near 2500 feet per second from an AR with a 110 grain bullet.

2400 is typical from a 16 inch barrel. 2500 would be more like a 20 inch barrel.