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Originally Posted by RichardAustin
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.


Based on MAX's/pressure tested data between the std. 257 and the std. 25/06 with like barrel lengths using H4350, checking the speed IS checking the pressure.
Of course having the cases and primers not showing any flags, 3,200 IS about it.

Personally, I'd knock it back a grain too......

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Originally Posted by RichardAustin
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.


You are a [bleep] idiot, and that's the best part of you.


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Yep, I'd personally run it at 50grs and call it a day.


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I agree with the 3,150-3,200fps notion or thereabouts. 3,300-3,325 is about comfortable with 100's in my 23" 25-284 and it's got a bit more room in the case. RL17 seemed to be the ticket there, when comparing with H4350. I want to say I hit pressure around 3,250 with the 4350.


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Just loaded
5 @ 48
5 @ 49
5 @ 50
5 @ 51
TTSX
Hodgded 4350
257 RobertsAI
Goal - 3150fps

I'll be at the range next week.

Thanks for the help, men. Appreciated.

Jim





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I've loaded 100-grain bullets of various sorts to 3200 fps in the standard Roberts with IMR4350, and had the pressure checked. It was fine, as it should be, since by the basic rules of interior ballistics the .257 Roberts should be capable of more velocity than the 6mm Remington with a 100-grain at the same pressure. There are a bunch of published loads at around 3200 or even higher for the 6mm. Nosler, for instance, lists a top velocity of 3261 fps for 100-grain bullets in the 6mm from a 24" barrel.

Consequently, when I was running a .257 AI (which was a few years ago) I expected a little more velocity than from the standard cartridge. The only accurate Barnes bullet in that rifle (a NULA Model 24) at that time was the 100 XLC, and I used 52.0 grains of H4350 for a little over 3300 fps. Dunno what the pressure was but based on all the usual signs, plus the results safely possible from the 6mm Remington and standard .257 Roberts I had no worries.


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Rug I've run a 257AI for 25years and used only 51.0gr IMR 4350 and 52.0gr of RL19 from a slow can of powder...both reaching 3050fps from a 21in barrel. You'll be fine. powdr

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Some more data:

Since the powder capacity of the .257 AI is about halfway between the standard Roberts and the .25-06, we'd expect potential velocity to be about halfway between them. We've already seen that the standard .257 should easily be capable of 3200 or so with 100's from a 24" barrel. .25-06 data from manufacturers who use the same barrel to work up loads and chronograph them indicates 3350-3400 fps is possible. Thus we come up with about 3300 fps in the .257 AI.

Also, the data for Accurate 4350 (which I've found similar to IMR and H4350) shows 52 grains as maximum with the 100 TSX from a 24" barrel, for a velocity of 3293 fps at 61,100 PSI.


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Ackley published one load for 100 gr. bullet of 50gr./ 4350 for 3,257/fs. I've had varied experience using his published maximum loads.


ETA: rug/Jim Vol. 1, page 336/337 of P. O. Ackley's HANDBOOK FOR SHOOTERS & RELOADERS , apologies for not knowing which edition.

Last edited by RichardAustin; 10/30/14.

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I am always amazed that people still considered Ackley's book a source of reliable data. A lot of the loads were a grab-bag from "various sources" (I believe that's the phrase used in the book), and some he acknowledged were estimated by the wildcatters who developed pet cartridges.

A few of the loads he personally tested were probably OK, but the more I learn about pressure-testing the less I trust any data from that era. A lot of people simply didn't know how to conduct repeatable and controlled pressure tests, which is why Speer used case-head expansion as their method, after nobody working there could figure out out to work copper-crusher equipment.

There are also two other factors: Nobody knows what bullet was used in most of the data in his book, or the primer, case, etc. And the powders used not only aren't exactly the same anymore, but the storage conditions are unknown.

There are a bunch of other errors in that book, which I won't go into since they're too numerous. It's an interesting slice of history, but not a trustworthy source of loading data.


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I picked up an almost full box of 117gr 25 caliber Remington roundnose bullets at a gunshow a few years ago. Inside cover of the box had some load data scribbled in pencil for the 257AI. That's what I use.


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I usually make up my own speeds, that way the cartridge can be what I want it to be....

The K Hornet can be amazing in that regard.

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I've heard that if you "short-cut" mil-surp H4831 in a Cuisinart, then fill up a K-Hornet case to the brim and seat a 40-grain bullet on top, the velocity is close to 4000 fps.


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I haven't "heard" that one...

Ackley "data" was filled with a lot of "I heard" and speculative, optimistic craziness.

In this case, having a lot of std. Roberts data and std. 25/06 data with H4350 and a chronograph is about ten thousand times more reputable, and repeatable, than anything original Ackley data could dream up.

I believe Ackley data had 3,450 with a 45 gr. bullet in the K-Hornet....just because it was "improved". Ouch!

Maybe it WAS chronographed somehow, but they used an old rimfire barrel?

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Originally Posted by HawkI
I usually make up my own speeds, that way the cartridge can be what I want it to be....

The K Hornet can be amazing in that regard.



The .223AI REALLY shines in that light. Especisally compared to the deuce mag.


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Now you're typing like Elmer Fudd, you wascawy Ackleyite....

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Originally Posted by ingwe
Originally Posted by HawkI
I usually make up my own speeds, that way the cartridge can be what I want it to be....

The K Hornet can be amazing in that regard.



The .223AI REALLY shines in that light. Especisally compared to the deuce mag.


Sounds like the result of too much fiber.

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His real handle is "Granola".....

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Originally Posted by HawkI
I usually make up my own speeds, that way the cartridge can be what I want it to be....

The K Hornet can be amazing in that regard.


Just add powder until you have to beat the bolt open with a hammer, then back down 1 grain. Back down 2 grains on a Remington 700, as the bolt handles fall off with minimal beating or prying so you want a proper safety margin. tired

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Originally Posted by Mule Deer
I've heard that if you "short-cut" mil-surp H4831 in a Cuisinart, then fill up a K-Hornet case to the brim and seat a 40-grain bullet on top, the velocity is close to 4000 fps.


I've found that it grinds better if you toast it in a cast iron skillet over an open fire first.


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