Non Barrier blind ammo velocities out of a 10.5"

I recently got the stamp for my SBR. I want to run the most efficient ammo through it. I have been researching for months, but it is hard to find velocity data from a 10.5" barrel. So, I ran a few rounds through a chrono. I wanted to find an open tip, non-barrier blind ammo for home defense. I want one with a velocity over 2300 FPS. Edit: Other criteria were figured out months ago.

This is not a scientific test. I only ran ammo that is NOT barrier blind. I might run some barrier blind later. I ran some XM193 and AE223 55fmj to give me a reference that I am familiar with. I sighted in at 100 yards with the Federal XM193 and ran 2-5 shot groups of AE223J for a confirmation of sorts. Then I ran 2-5 shot groups at 100 yards of all I had. Edit: A small sample size. As I said this is not a scientific test. I ran it to record the data. I figured I would share it.

It was no surprise the Black Hills MK262 and the Hornady TAP 75gr T2 retained most of their published velocities. The MK262 had better groups.

The best groups were from the Hornady Steel Match, but all ammo had acceptable groups.

The PPU performed very well. Considering the low price, this is a serious contender.

The Hornady Match 75gr BTHP and the Fiocchi 77gr SMK had velocities below the 2300 fps requirement, so I stopped with one 5 shot group.

Weather:
Sunny to partly cloudy
80 degrees
60-80% humidity
Breeze. 5-10 mph, at my back

Set up:
10.5" FN chrome lined barrel, 1:7 twist, 5.56 NATO chamber
CMT-TAC upper/lower
Young Mfg BCG
YHM QD Brake
ALG Defense QMS with yellow JP Springs. Breaks at 4.5lb.
Spikes ST-T2 buffer
Nikon P223 4-12x40 BDC 600
Pro Chrono at 10 feet








I am to lazy to post all the pics of the groups, but you can see the 5 shot groups in this photobucket album:
Pics of groups

Some of the groups shot very low. Sometime during the TAP groups, I must have moved the zero. I re-zero'd between the PPU groups.


edit: Corrected XM193 BC.

To Jim K: We all know velocities are slower from shorter barrels. I wanted to have a warm and fuzzy for the ammo I select for my first SBR. I figured i'd share. However, some cartridges performed much better with retained velocities per penny.

To rcmodel: Barrier blind bullets will penetrate barriers easier, such as sheetrock, glass, body armor, etc. Usually bonded jacketed bullets, solid core, solid base, all copper and penetrators are considered barrier blind. Gold Dots, Bear Claws, TSX, MK318 and M855 are some barrier blind cartridges.

God forbid I ever need to use this SBR in defense, I want a bullet that is not barrier blind so there will be less of a chance of wall penetration in the house. The non bonded OTM's, non bonded jacketed hollow points and varmint bullets are usually not barrier blind. The heavier OTMs will penetrate heavy clothing and have great terminal ballistics, but should penetrate less through barriers.

Edit: All guns are loud and can damage your hearing. I have a suppressor on the way, but even with a can it will cause hearing damage. The can I ordered, warranties a 10.5" and the ammo I selected is also covered. I researched this a year ago. It is presumptuous to assume otherwise. This gun is more for fun than anything. I doubt I will ever need it for anything other than punching paper. It is fun to shoot, record and try to learn from the data. Hopefully, someone else can use the data.

Please, stay on topic.

If anyone is interested in barrier blind and duty loads, here is a good wright up by Dr. Roberts.

http://pistol-forum.com/showthread.php?4344-5-56-mm-Duty-Loads