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I was about to load some 100 grain TTSX for my Roberts AI so I read my record of the work up with 100 grain TSX. I had recorded 51grains H4350 with 100TSX. That seems like a HOT load.
Chronographed; 3201, 3225, 3209 3216 3221. 22 inch barrel.

Can someone tell me what pressures that is producing. CUP or PSI will be OK.

I like my Roberts AI. I like my face. I like my life. I like keeping them all intact!

Thanks
Jim

Last edited by Rug3; 10/29/14.

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sounds like a max load for a 25-06AI, don't think I'd be stuffing that much in a Roberts. Can you even fit that much in a Roberts case?


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Sounds like Dick Austin is being an idiot again.

I think you are likely right at the edge with that load. 3200 or so FPS is what I'd be looking for with that powder.


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Originally Posted by Steelhead
Sounds like Dick Austin is being an idiot again.

I think you are likely right at the edge with that load. 3200 or so FPS is what I'd be looking for with that powder.


Steelhead I welcome you to stuff 51 gr. into a 257ai; I hear blue dot will go 3200. Try it.

To OP, steelhead's an idiot. Don't load anything he says until you've double checked it someplace valid, like a Hornady or Nosler reloading book. In fact IMR/Hogdon has their info online which is where you should check. Repeat, steelhead - big mouthed idiot - IMR info good.


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Scott

Thanks for weighing in. Any idea how I could find the pressures produced here?

Thanks
Jim


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hang in there, scottie will be right back with the pressure.


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Originally Posted by RichardAustin
sounds like a max load for a 25-06AI, don't think I'd be stuffing that much in a Roberts. Can you even fit that much in a Roberts case?


MAX load for a 25-06AI is 5 to six grains MORE, three grains more for the std. 25/06 in Sierra's latest.

3,100 from a 22" std. 257 is about it. Going to 3,200 in a 22" 257 AI is also going to be about it, since the 25/06 will get 3,330-3,400 depending on barrel length.
(Nosler lists a 100 BT from a 24" barreled 257AI with I4350 at 3,208 with 56.6gr water capacity)


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Originally Posted by Rug3
Scott

Thanks for weighing in. Any idea how I could find the pressures produced here?

Thanks
Jim


51 grains is at max or a little over, I wouldn't start there but I wouldn't be scared to work up to that starting out at maybe 48 grains.

Pressure is found in a pressure barrel, no real way for you to find pressure without one. All you can do is rely on the data provided in your reloading manuals, and check your brass for signs of pressure.









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RichardAustin

I don't have the Hornady book at hand but I do have the Nosler book here. Could you give me the page number that addresses H4350 in 257 RobertsAI? I would like to read their commentary.

The Roberts case easily contained 52gr of H4350with 100gr TSX when I was reloading them. They trickled in just fine. I shot some but I was not pleased with pressure signs. So I expect I'll not need to "stuff" 51 grains. Just want to know the pressures.

Steelhead may be a hardhead but he has weighed in on several questions I've had in the past and has been accurate and helpful. He, too, can probably read the books.

Thanks
Jim


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Originally Posted by Rug3
RichardAustin

I don't have the Hornady book at hand but I do have the Nosler book here. Could you give me the page number that addresses H4350 in 257 RobertsAI? I would like to read their commentary.

The Roberts case easily contained 52gr of H4350with 100gr TSX when I was reloading them. They trickled in just fine. I shot some but I was not pleased with pressure signs. So I expect I'll not need to "stuff" 51 grains. Just want to know the pressures.

Steelhead may be a hardhead but he has weighed in on several questions I've had in the past and has been accurate and helpful. He, too, can probably read the books.

Thanks
Jim


Well Jim, you do seem to have computer access, so why not check the IMR /Hogdon site if you really want that info? I have no problem with you doing as steelhead would, have at it.


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As I said, I think 51 would be about max. Once I hit 3200fps I'd stop and not be skeered to drop it a grain.

I know we've run 51-52 with the XLC, it was a Barnes listed load in an older manual. TSX and XLC tend to be kinda close in my experience.

Just checked and they showed 48.5 of H4350 with the 100gr X, which tends to be more sticky a bullet and I'd expect to get a few more grains in.

Load to velocity is how I'd roll and be content to stop at 3200. What's it doing at 50?


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Originally Posted by Steelhead
As I said, I think 51 would be about max. Once I hit 3200fps I'd stop and not be skeered to drop it a grain.

I know we've run 51-52 with the XLC, it was a Barnes listed load in an older manual. TSX and XLC tend to be kinda close in my experience.

Just checked and they showed 48.5 of H4350 with the 100gr X, which tends to be more sticky a bullet and I'd expect to get a few more grains in.

Load to velocity is how I'd roll and be content to stop at 3200. What's it doing at 50?


My Nosler manual shows several propellants topping out at or just above 3200, including the IMR version of 4350. Seems like a reasonable ceiling to me.

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I took my 24" Nula Bob AI to 3309 with 51/H4350 and the Nos 100 BT as well as the XLC. I would NOT go any higher.
But for an everyday load I switched to R19.


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I use 46.5 grains of H4350 under a 100TSX from a Kimber roberts, no pressure signs


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Looking at Hodgdon's site shows the 6mm Rem. producing better than 3100 fps with 100 grain bullets and both H and IMR 4350.

That's a smaller diameter neck on the "non-Ackleyed" version of the case.

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As has been pointed out, based upon my experience (which is admittedly limited) that is likely a hot load I'd not make hotter.

Check out the Nosler data online; IIRC (please check this) they list 51 gr IMR-4350 as max w/ 100 gr Noslers which would include the ETip which is stickier than the TSX.

Scott is right on when he suggests letting your chronograph be your guide.

If its any consolation I've been getting 3330 fps from 50.5 gr IMR-4350 & 100 gr Speer HPs for several loadings (>3) without any sign of issues w/ the RP brass in my 24" barreled 257 AI.

Along with the chronograph I like to reload 3 cases and fire them first each time I visit the range just to see how many firings I get before issues arise. Probably overthinking things, but as you say my rifle and especially my face are worth it.

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Originally Posted by Steelhead
What's it doing at 50?


3152


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"My Nosler manual shows several propellants topping out at or just above 3200, including the IMR version of 4350. Seems like a reasonable ceiling to me."

Thanks
I have some IMR 4350 but I have a lot more Hodgdon 4350. So...... Lookin to use the Hodgdon.

Thanks
Jim


BE STRONG IN THE LORD, AND IN HIS MIGHTY POWER. ~ Ephesians 6:10

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Originally Posted by Steelhead
As I said, I think 51 would be about max. Once I hit 3200fps I'd stop and not be skeered to drop it a grain.

I know we've run 51-52 with the XLC, it was a Barnes listed load in an older manual. TSX and XLC tend to be kinda close in my experience.

Just checked and they showed 48.5 of H4350 with the 100gr X, which tends to be more sticky a bullet and I'd expect to get a few more grains in.

Load to velocity is how I'd roll and be content to stop at 3200. What's it doing at 50?


Brilliant. Check velocity at a pre determined speed and forget pressure. Just bloody brilliant.


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Originally Posted by Rug3
"My Nosler manual shows several propellants topping out at or just above 3200, including the IMR version of 4350. Seems like a reasonable ceiling to me."

Thanks
I have some IMR 4350 but I have a lot more Hodgdon 4350. So...... Lookin to use the Hodgdon.

Thanks
Jim


I wasn't suggesting the IMR, just commenting on the nature of a reasonable max speed with that class of propellant.

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