Barnes 140 TTSX 7mm issues. Help :)

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Brianma65

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I’m loading Barnes TTSX 140 /7 mm
Once loaded to COL the bullits have a small amount of in and out move ment.

In the pic are the two extre movements, once at either end , they can’t be moved.

It’s pretty much happening on the the ring.

Does not happen with any other bullits, I’ve tryed.

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dero338 said:
your problem looks like not enough neck tension. but to be honest, all issues I had with barnes bullets have been solved by going back to nosler
Click to expand...
I thought neck tension was the problem, but I can’t oust the bullit in or pull it out, it just has that 2 mils of movement, right at the groove .
 
The problem is lack of neck tension. I have been loading the TSX/TTSX/MRX for years, with no such problem. How far off of the lands are you seating them?
 
stubblejumper said:
The problem is lack of neck tension. I have been loading the TSX/TTSX/MRX for years, with no such problem. How far off of the lands are you seating them?
Click to expand...


Haven’t checked that. Just loading them to Barnes specs 3320.
Just going to make some hunting rounds.

I thought neck tension as well but they can only move a couple mils, in either direction. Right at the ring.
I only resize brass with full lenght dies, set up to manufacture directions
 
It looks like the groove is lining up with the end of the case. The brass is trying to grab where the groove is and is loose you will have to seat the bullet deeper or shallower to grab the bullet tight (not in the groove)
 
Last edited:
Brianma65 said:
I’m loading Barnes TTSX 140 /7 mm
Once loaded to COL the bullits have a small amount of in and out move ment.

In the pic are the two extre movements, once at either end , they can’t be moved.

It’s pretty much happening on the the ring.

Does not happen with any other bullits, I’ve tryed.

View attachment 167903
Click to expand...

I've seen it before with Barnes bullets of a few calibers. It doesn't happen all the time, but often enough.

The problem is inadequate neck tension. The cure is to take a thousandths or two off the expander ball providing that you can feel resistance when pulling the case over the ball now. If you can't it won't help. The way I take it down is to take the whole assembly out and chuck it up in a drill. Then I measure the ball to get a base-line. Next start up my 2 x 72" belt grinder and touch the spinning ball to the spinning belt. It doesn't take much. When the desired amount is removed size your cases again and they will be tight. If you don't have a belt grinder you might be able to polish it down by spinning in emery cloth or quality sand-paper; providing you have the patience of Job. That material is hard.
 
Ya, Dogleg I don’t think I want to go that far,

I could load them deeper or shallower, I guess ,as just achip suggested.


I think I might just sell them and stick with the Nosler:)
 
Brianma65 said:
Haven’t checked that. Just loading them to Barnes specs 3320.
Just going to make some hunting rounds.

I thought neck tension as well but they can only move a couple mils, in either direction. Right at the ring.
I only resize brass with full lenght dies, set up to manufacture directions
Click to expand...


The COL listed in the Barnes manual is pretty much meaningless for your rifle, as the throat length varies from rife to rifle. As well, seating monometal bullets close to the lands can cause significant increases in pressure, so it is a good idea to know where you are seating them, especially if you are loading close to max loads.
 
Brianma65 said:
Ya, Dogleg I don’t think I want to go that far,

I could load them deeper or shallower, I guess ,as just achip suggested.


I think I might just sell them and stick with the Nosler:)
Click to expand...

Deeper or shallower wont help. Something that you can do for a test if you doubt the neck tension being the issue is size one case to decap it and size it again without the expander assembly. That will give you all the tension that your set up can produce. Seat that bullet and I bet you can't budge it.

Or use the Noslers.
 
stubblejumper said:
The COL listed in the Barnes manual is pretty much meaningless for your rifle, as the throat length varies from rife to rifle. As well, seating monometal bullets close to the lands can cause significant increases in pressure, so it is a good idea to know where you are seating them, especially if you are loading close to max loads.
Click to expand...
I just made a dummy round, it measures 3396,Barnes lists 3230...
That’s a lotta jump.
If I seat them just past the ring, to 3195 ,they have lots of tension.

So I could load them just below the ring ,at 3195 or just above at 3240.

Either way there still a good distance from the lands.

Do you think 3195 would be better?
 
Dogleg said:
Deeper or shallower wont help. Something that you can do for a test if you doubt the neck tension being the issue is size one case to decap it and size it again without the expander assembly. That will give you all the tension that your set up can produce. Seat that bullet and I bet you can't budge it.

Or use the Noslers.
Click to expand...
Below or above the groove,gives me lots of tension:)
 
Brianma65 said:
I just made a dummy round, it measures 3396,Barnes lists 3230...
That’s a lotta jump.
If I seat them just past the ring, to 3195 ,they have lots of tension.

So I could load them just below the ring ,at 3195 or just above at 3240.

Either way there still a good distance from the lands.

Do you think 3195 would be better?
Click to expand...

Start at .050" off of the lands. I usually end up between .040" to .070" jump for the best accuracy.
 
Give them a try before you abandon them, they shoot well when you find the sweet spot . They look a little funny when you seat them in to spec but it works. Good luck
 
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