[ctdonath2]

If you don’t hold a NFA license, you won’t be able to own a 14.5” barrel for a AR, so let’s not worry about that.

I have an 11.5" AR (Colt 6933 M4LE, as close to a true M4 as a civvie can get), that's why I'm interested. (Yes, it's NFA papers are in order.) I have a small & diminishing supply of Mk262 that it rather likes, hence my question.

You can obtain a commercial loading of the 77gr Sierra bullet from Black Hills Ammunition, at a bit over 2,700 fps.

Got a link handy?

[Pistolshot]

Here you go. Short barrel rifles are much cheaper than Full-auto, but still need the tax stamp.

http://www.autoweapons.com/products/sbr.html

[NVDave]

For the Sierra 77gr Matchking loaded by Black Hills:

http://www.black-hills.com/rfactorynew.htm

Click on “.223” then look down in the lower right of the listed loads and you’ll see the civilian version of the M262. NB that this appears to be loaded to SAAMI maximum specs, not the M262 muzzle velocities.

For the Nosler round:

http://www.nosler.com/index.php?p=11&b=3&s=147

Scroll down to the bottom, and you’ll see their version.