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I'm forced to shoot a lead free bullet out of my 257 roberts and decided the barnes TTSX's would be a good place to start. I shoot a m77 with a 20 inch barrel and for 25 years have shot sierra 120 grain hpbt's at 2700 fps. 400 yards is about MY limit and this combo has always worked fine, when I do my part.
I tried the 100 grain TTSX the other day and accuracy was great but could only produce about 2800 fps, with a few different powders before I got pressure indicators in my rifle. Is 2800 going to be enough to reliably open up the 100 grain at 400 yards or would I do better at 400 pushing an 80 grain at maybe 2950? The copper bullet is brand new to me so any real world insight would be appreciated.

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Originally Posted by J257
I'm forced to shoot a lead free bullet out of my 257 roberts and decided the barnes TTSX's would be a good place to start. I shoot a m77 with a 20 inch barrel and for 25 years have shot sierra 120 grain hpbt's at 2700 fps. 400 yards is about MY limit and this combo has always worked fine, when I do my part.
I tried the 100 grain TTSX the other day and accuracy was great but could only produce about 2800 fps, with a few different powders before I got pressure indicators in my rifle. Is 2800 going to be enough to reliably open up the 100 grain at 400 yards or would I do better at 400 pushing an 80 grain at maybe 2950? The copper bullet is brand new to me so any real world insight would be appreciated.


What powders were you using? That speed seems really low.

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Mathman,
IMR 4350 and IMR 4831. They're what I had on hand. I am shooting out of a 20" barrel. 44 1/2 grains of 4350 and 46 grains of 4831 both started to get heavy bolt lift and flat primers.

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Do you have the seating depth set so that there is some bullet jump before the bullet gets to the lands? If not, that can boost pressure with mono bullets.

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Have more experience with the TSX than the tipped version. I like to have at least 2000 fps for reliable expansion.
The TTSX may open better at lower velocities down to around 1600-1800 fps.

At 400 the 100 grain will be at around 2000 fps the 80 slightly slower. Both should work if limited to that range.


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I would reach out to Barnes and ask the min velocity for expansion on the bullets in question. I've discovered that pretty much all of their bullets have different velocity envelopes.

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Utah,
I set at 50 thousanths jump on the first run. I'll try 70 on the next.

Tejaho,
Your info makes me feel a little more at ease. How do the 100 tsx's work for you at 400?

Tar,
That's a good idea. I didn't think about asking a technician about a specific bullet.

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10-4. I was surprised. I always used the 1800 fps guideline, but then I asked about the .308 168 and they told me it's good down to 1500 fps. It made me question them all. Now I just ask before I start loading them to get a straight answer. I've seen anywhere from 1500 - 2000 fps for a min.

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I always use 1800 FPS with Barnes as the minimum. If you can find some hybrid 100v it works well in the Roberts.

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805,
Does Hybrid 100v give excellent velocity with low pressure?

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Originally Posted by 805
I always use 1800 FPS with Barnes as the minimum. If you can find some hybrid 100v it works well in the Roberts.


I did too, but once I learned they have data to support lower for some cartridges, I use their data.

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Originally Posted by J257
Utah,

Your info makes me feel a little more at ease. How do the 100 tsx's work for you at 400?


My experience is with the 6mm 100 to about 350 yards and it worked fine at just slightly higher velocities. Likewise the 120 7mm to about 480 yds but starting at 3400. Both of these were good for many head of game at lessor distances.

The tsx will just open up partially at 1600 fps. I really like more speed and bigger mushrooms is why my comfort level is around 2000 fps. TTSX not sure but should be fine at 1800 fps possibly slower. On test media they open up down to 1600.


"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli
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It would seem I'll be ok. I think I'll just put them to the test. I sure hope someone comes out with a little softer CA compliant bullet soon. I've hunted the same ground, with the same rifle, most of my life - It would be hard to change my hunting style now.

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Starting at 2800 fps my ballistic calculator shows it at 1863 fps at 400 yd.


The latest Barnes manual shows 44.5 gr of IMR 4350 should give around 3124 fps.


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100 gr. TTSX with H100V in the .257R is a great combo and a killer on hogs and WT's.

http://www.24hourcampfire.com/ubbthreads/ubbthreads.php/topics/10163944/6

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Old willys,
I looked at that Barnes manual and the test barrel is 24". It's crazy but a 20" barrel, with the same load equates to 2800.

DrtFarmer,
I'm going to look into H100v. It seems a lot of people like it for the 257. For now, I'll run the 100TTSX and if faced with the 400 yard shot, just shoot for bone. Just watch, It'll be a windy year and I won't shoot over 200.

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[Linked Image]

I got this buck that was so big his nose drug on the floor like a elk, with a 115 gr Nos Bal Tip.

It was 257 Roberts Ackley Improved rimmed that I formed with 7x57 rimmed Norma brass that was so soft that 49 gr H4350 3050 fps was all I could get out of it. I built on an 1885 action and sighted in out to 400 yards. I shot 3 deer with it out to 400 yards in 2012 and all were bang flop.



There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. -Ernest Hemingway
The man who makes no mistakes does not usually make anything.-- Edward John Phelps
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J257,

H100V is a great Roberts powder, one of the best performers in that round.

But if you're hunting in extreme cold, you may want to reconsider as there are others more temp resistant.

Where I hunt, no problem.

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I think you will do fine with the TTSX. But here is another interesting option. http://www.lehighdefense.com/collec...city-lead-free-bullet?variant=1073850700

This may be better for coyotes and they may have a narrow velocity window to perform as designed 2000-4000 fps is what they state.

I have only just started playing with the 17 cal. version. It's explosive on milk jugs and very little chance of a ricochet. I would use them on a broadside shot for deer at moderate ranges. What happens when velocity drops below 2000 fps I don't know yet?

Another option may be Reloder 17 or 26 both are great in the 243 and R26 works well in the 25-06 but may or may not pan out for the Roberts.



"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli
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I checked out their link, interesting bullets.

I have limited experience with the Cutting Edge in .308. Haven't tried them in the Roberts.

Sounds similar, would love to see a comparison.

http://www.24hourcampfire.com/ubbthreads/ubbthreads.php/topics/10719100/1

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