Anyone tried this load yet?
http://www.midwayusa.com/viewProduct/?productNumber=853773
I’m thinking it would be a good choice for a 1:7" weapon. I have some 70gr TSX 5.56mm from SSA. It’s a hot load but it’s not the most accurate, particularly in my carbine. Not too bad in my 20" rifle (2 MOA). Both weapons have 1:7" rifling and shoot 75gr 5.56mm TAP very nicely for NATO chambered weapons. I’m thinking of giving the Blackhills 62gr TSX offering a try in my carbine.
Thoughts?
I think these may be good for a SBR. I may have to try some out when I get my 11.5" done.
Search is your friend…
https://www.m4carbine.net/showthread.php?t=50642
Funny that you replied to this thread.
More info from Doc…
Black Hills makes great ammo–this BH 62 gr TSX load is no different. If you are making longer range shots both the 62 gr and 70 gr TSX offer good performance. However, for most civ and LE carbine use, especially with SBR’s, the 55 gr Barnes TSX seems optimal–it also has the added benefit of working in 1/12 twist barrels…
Here has been our department’s experience with the TSX round.
We issue a combination of 16" 1:9 twist carbines and DRSO 20" 1:12 twist rifles. There are some personally owned 1:7 twist carbines that are approved and in service.
Our duty round is a 55gr TSX round and the research we conducted was pretty much based on what DocGKR has put out in regards to this round.
It has been right around 2 - 3 MOA out of all of our rifles and except for the M/O rifles which are currently 20" DRSO M16s, we consider this an acceptable degree of accuracy and have compiled enough information to defend this choice should it be an issue in an OIS.
55 and 62 gr FMJ continues to be around 1 - 1 1/2 MOA and is our training round and our duty round for our M/O teams. We are currently testing other rounds to be used as a duty round for our M/O teams.
Why we feel that the 55gr TSX round is the best duty round for our patrol and emergency response unit is that it acheives an acceptable degree of accuracy. It shoots within the capability of the rifle, optic and shooter.
The 55gr TSX round is better in regards to terminal performance, performance against intermediate barriers and does not pose as much of an overpentration risk as FMJ rounds would.
These factors are far more important to us as an organization than the most accurate round possible as the degree of accuracy associated with this round is certainly acceptable given our mission.
Our experience out of the 1:12 twist 20" DRSO M16 barrels with the 55gr TSX and 62 TSX rounds have been between 3 and 4 MOA.
For comparison, 55gr Fed AE out of the same rifle has been 1 to 1 1/2 MOA.
Hope this was helpful in looking at the big picture.
YMMV.
Why such poor accuracy compared to AE FMJ loads?
Don’t have an answer for you on that. We just deal with the what are’s.
DocGKR may have an idea or answer for you.
I forgot to mention, is this the Black Hills TSX loading you are talking about with the up to 3-4 moa accuracy?
55gr TSX is Federal TRU loading and 62gr TSX was Black Hills loading
Realize this is external ballistics, but can anyone shed some light on why accuracy would open up this much? Something to do with the all copper construction and that leading to consistency problems or what?
When properly loaded and adequately stabilized, the Barnes TSX projectiles are capable of delivering excellent accuracy. The sub-MOA 10-shot group pictured below was fired from a Krieger barreled AR-15 using a hand-load of the Barnes 62 grain TSX.
Due to their all-copper composition, the Barnes TSX bullets are significantly longer than traditional lead-core/copper jacketed bullets of the same weight. The TSX bullets also have much lower specific gravities than lead-core/copper jacketed bullets.
The TSX bullets are even longer than some heavier lead-core/copper jacketed bullets.
Because of their longer comparative length and lower specific gravities, the Barnes TSX bullets require faster twist rates to adequately stabilize them compared to lead-core/copper jacketed bullets of the same weight. One of the first indicators that a bullet is only marginally stabilized is an inordinate degradation of accuracy at distance. As an example, a 1:9” twist does not adequately stabilize the 70 grain TSX. The 10-shot group pictured below was fired from an AR-15 with a 1:9” twist barrel from a distance of 50 yards and it’s a perfectly respectable group. However . . .
. . . the next 10-shot group shown below was fired from the same 1:9” twist barrel with the same 70 grain TSX load, except this time it was fired from a distance of 100 yards. You can see a large increase in the relative group size and in this example some of the rounds even demonstrate key-holing.
Fire the same 70 grain TSX load from a barrel with a twist rate that adequately stabilizes it and the accuracy is dramatically improved.
Even though the 55 grain TSX is a flat-base bullet, it is still longer than a typical 55 grain lead-core/copper jacketed FMJ-boat tail bullet due to its all-copper construction and as with the other TSX bullets, it has a much lower specific gravity than lead-core/copper jacketed bullets.
When fired from typical length AR-15 barrels with twist rates of 1:12”, the 55 grain TSX is only marginally stabilized. Combined with other variables, this could easily account for the poor accuracy seen with this combination of bullet and twist rate. The 62 grain TSX shouldn’t even be considered for use from a 1:12" twist barrel.
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I don’t think Molon has any idea what he’s talking about… 
Very good data as always.
Thanks Molon.