I thought this round was supposed to bring the accuracy, long range shooting and SBR performance of the MK262, with the armour piercing of the M855 and better blind barrier capability.
Doc- did you do gel and barrier tests too?
It doesn’t seem to do anything well?
maybe thats why its showing up on the civilian market
I have the idea that the accuracy issue stems from the grooves which appear lathe-turned. At 300,000 or so RPM’s I can imagine that if the grooves are not perfectly concentric to the rest of the bullet, it could affect accuracy.
What is the purpose of the ridges?
Reduces pressure compared to a conventional bearing surface.
Disregard…Google is my friend 
This stuff is showing up everywhere, anyone have an idea why? Are these rejects, contract overruns or are they not performing well and they canceled the project?
I only found one vendor and it was too pricey. Are you finding more?
Duh…once again Google is my friend! Palmetto has them now. Hopefully we’ll start seeing more and the CPR will come down further.
What FPS will these expand down to?
What FPS will these expand down to?
…
Is the brown box from PSA?
Curious to see if there are any velocity or accuracy differences…
- V e l o c i t y - C o m p a r i s o n -
Following the same chronographing procedures outlined in the first post of this thread, I compared the velocities of T556TNB1 “white box” MK318, to that of AB49 “brown box” MK318. The two versions were fired “back to back” from three different barrel lengths:
14.5” Colt M4A1 (the same barrel used for the first post)
16” Colt light-weight barrel, 6520
20” Colt M16A2 (a different barrel than the one used for the first post).
All three barrels are chrome-lined and have NATO chambers and 1:7” twist rates. The velocities listed below are muzzle velocities as calculated from the instrumental velocities using Oehler’s Ballistic Explorer.
Atmospheric conditions.
Temperature: 72 degrees F
Humidity: 68.1%
Barometric pressure: 30.02 inches of Hg
Elevation: 950 feet above sea level
….
I just got 3 boxes of this from Palmetto. We’ll see what type of accuracy I get…
From talking to someone that is connected to Federal, the ammo we are currently seeing is rejects.
I hope to have some LE version of the MK318 coming soon.
C4
I think I’ll hold off on getting some of this stuff then.
Any idea the reason for the rejection?
Ok, I did some checking. It could be anything from a dent in the brass to low pressure. From looking Molon’s review, it could be that.
I have two cases the LE version on its way to me now.
C4
That’s disappointing. I hopped in the same time as B31, though if it works well enough in my 14.5" units, then I’ll be thrilled, and wait to pick up something else for my SBR’s.
Thanks for checking.
If Molon’s lot is representative of rejection for insufficient velocity/pressure, I wouldn’t be too concerned about the velocity deltas between lots. His velocities are still pretty high for barrel lengths tested. Of course, his could have been rejected for case defects or some other abnormality, but if it runs, it runs.