Sniper & Sharpshooter Forums banner

1 - 8 of 8 Posts

·
Registered
Joined
·
777 Posts
Discussion Starter #1
I called up Barnes today and asked the friendly technical specialist a few questions about a .223 load I brewed up in my head that you all have heard me screeching about from time to time. So, here's the facts:

The load is a 70 grain boat tail triple shock X bullet, and the intended use is as an ideal AR-15 loading for "interdiction" type rifles such as the SPR, SAM-R, Mel's SCIMITAR, or other heavy barrel scope sighted AR. The barrel needs to have a 1:8 or 1:7 twist to stabilize the round. I also like the idea of 5.56 NATO chambers over SAAMI .223 but that is just personal opinion. Load data is not yet published, but the next Barnes manual will probably have it (conjecture) or you can try asking Barnes directly. This is what Barnes had to say to my questions:

Can it be loaded to magazine length? YES
Is a 1:8 completely sufficient? YES
What is the maximum speed? approx 3100 fps
What barrel length is testing done in? Standard is 24", however it may have been done in as short as 18", since this bullet is intended for ARs. The precise data on barrel length wasn't readily available.
How is bullet availability? There should be no shortage of supply.

So, as it turned out, all of my questions were answered favorably, and they even got it to go 100 fps faster than I originally proposed. The nature of the TSX bullet should make it a good performer from all standpoints. I was thinking of this as a 0-600 meter cartridge, although I'm sure it would perform even further. Being intended for semi-auto use, I think it should be crimped too. Here's a little data courtesy of the free point blank calculator:

.224" 70gr .314 BC .199 SD @ 3100 fps at sea level 90 degrees F.
Muzzle Energy: 1494 ft/lbs
600 yard velocity/energy: 1612 fps/404 ft/lbs
600 yard flight time: .809 seconds
600 yard drop/wind drift 10mph: 103.04"/40.2"

and just for grins, the 1k yard figures:
1k yard velocity/energy: 1052 fps/172 ft/lbs
1k yard flight time: 1.754 seconds
1k yard drop/wind drift 10mph: 434.49"/138.35"

I believe this is an excellent .223 load. Bullets are fairly expensive, so handloaded ammo would probably be in the vicinity of 75 cents a shot or so (conjecture). Set this up with an accurate AR-15 and a Leupold M3 3.5-10x with a custom BDC knob and you'd have a real winner of a system. Of course, this is only my opinion... :D but I think it is a well thought out and practical one.

Thoughts?
 

·
Registered
Joined
·
777 Posts
Discussion Starter #3
pittbug:

Barnes warns that the 70 grain TSXBT will not be stabilized out of a 1:9" twist. A 1:8 or 1:7 is required.

Consider the Barnes 53 grain TSXFB for your rifle. It should be compatible with your rifling twist, Cor-Bon makes loaded ammo in this weight bullet, the bullets are also available for handloading, and you should be able to use published Barnes XLC data for that load.
 

·
Premium Member
Joined
·
7,927 Posts
I think it's a great load, Bead Drawer. I'm impressed :D
 

·
Registered
Joined
·
777 Posts
Discussion Starter #8
Caver,

No argument here about the heavy match bullets for shooting paper. My idea with this load is better performance against barriers, deeper penetration, no bullet failure (homogenous) greater expansion, etc.

The .223 really dislikes being shot through things, this would be one of a very few .223 loads that could do it reliably, and also get the job done once it went through. Against unshielded targets, the effect would also be very good, even at distance.

Of course, rather than go with one or the other, why not do both? :D
 
1 - 8 of 8 Posts
Top