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Old October 14, 2012, 04:47 PM   #1
mohr308
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Barnes .223 rem 55 gr TTSX OAL ?

Im going to give these Barnes TTSX 55 grain for .223 rem a try, but Im not sure what I would use as my OAL. The data I have from Barnes only states the TSX OAL (2.180") not TTSX. I was going to use the standard 2.250", but before that I figured I would ask for your opinions. I will be firing these out of an AR-15.
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Old October 14, 2012, 05:21 PM   #2
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I don't know the length difference. Best just to call Barnes and ask. (800) 574-9200. They're on Mountain time.
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Old October 14, 2012, 06:53 PM   #3
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i guess i will have to wait to start loading
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Old October 14, 2012, 07:24 PM   #4
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That's often the penalty for using relatively new components. On the other hand, you get to be a pioneer, of sorts. As Charlie Papazian might say: Sit back. Relax. Pop the top off a home brew. Contemplate ballistics.

What twist rate does your rifling have?
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Old October 14, 2012, 08:45 PM   #5
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Seat .224" of the shank into the neck. If they don't fit in the mag, seat deeper.

Barnes should tell you "We don't have your gun, so we have no clue what oal will work for you."

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Old October 14, 2012, 10:25 PM   #6
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its a 1:9 twist, barnes recommends 1:9 or faster. 2.260" is the absolute max that will work in my mag, and thats cutting very close.
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Old October 15, 2012, 01:38 AM   #7
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I may be telling on my self here, but I haven't measured a .223 case in years. I load mine to magazine length and have had nothing but great results. Of course, I now have batches of .223 in two different lengths as the CZ 527 allows for a longer length in their clips than any of the AR clips I have.
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Old October 15, 2012, 09:59 AM   #8
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So I just got off the phone with Barnes support, they said its the same COL as the TSX bullet, 2.180", to me that doesn't make sense. The TTSX is a ballistic tip and the TSX is a hollow point. Thats just going to push the ogive back even further from the rifling. The TTSX bullet is .103" longer than its non-tipped hollow point version. I guess its time for some experimentation on this little bullet.
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Old October 15, 2012, 10:07 AM   #9
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quick update, I just grabbed a bullet and a casing and set the bullet back to make the OAL @ 2.180" and the ogive of the bullet was just inside the neck of the brass. Im going to say that is NOT a very good OAL to use. I guess I could've done that before calling them.
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Old October 15, 2012, 12:33 PM   #10
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Sorry they were such poor help. The best way is to get the ogive positions to match where they touch the lands, but unless you have the TSX on hand, you don't have that option. On the assumption the ogive shapes are very close to the same, you could go by seating depth. In this case, you can measure the average length of the TTSX bullets. Then call Barnes to ask what length the TSX HP is? Subtract that length from the TTSX length, and add that difference to 2.180". See how that fits?
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Old October 17, 2012, 12:49 AM   #11
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Worth a try
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Old October 17, 2012, 07:04 AM   #12
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Quote:
Seat .224" of the shank into the neck. If they don't fit in the mag, seat deeper.

Barnes should tell you "We don't have your gun, so we have no clue what oal will work for you."
^^^^This^^^^
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Old October 17, 2012, 09:17 AM   #13
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This is from Barnes site


Do I seat TSX bullets .030 inch to .070 inch from the lands, starting at .050 inch off the lands, as recommended with other X-style bullets?
Yes. All-copper TSX Bullets typically give better accuracy when seated off the lands and grooves (the rifling in the barrel).
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