Cast lead in .458 SOCOM

[GSPKurt]

Where can I find load data for cast/coated bullets in the .458 SOCOM? I am finding limited data from Accurate, mostly jacketed data.

[44Blam]

That's one your probably going to have to develop... My first thoughts on the subject is that something like H4198 or H4895 are going to be appropriate powders especially if your barrel is in the 16 or 18" range.

I've been looking at a .458 Socom upper and my thoughts on load data is to just start out lighter than jacketed and bring some primed cases, lee hand press and some powder to the range and see what the gun actually likes.

[GSPKurt]

Ok, thank you so much for the input.

[44Blam]

One boolit I shoot in my Marlin is this one: NOE SC460-350-RF-AE1
I think this would be appropriate in 458 Socom.

[44Blam]

Started poking around and Nosler has a load for a 300 grain bullet:
https://load-data.nosler.com/load-data/458-socom/

It looks like they were running compressed loads for 4198 - so I don't know what your planning on shooting but if I was gonna shoot the 350s, I'd probably see how far the base of the boolit goes into the neck and start at maybe a 90% fill? Looks like maybe 33 or 34 grain. See how that functions / shoots / chrono's and go from there.
I'm just thinking out loud at this point - I think I would also do a 4895 load just to see what a slower recoil impulse load does.
Funny thing is that their "Accurate load" was IMR4227 which is close to W296/H110. I know a guy that uses H110 for 458 and when he told me that I thought that it was way to fast for that round - but maybe not? Might be worth trying...

[dkf]

I usually just make educated guesses off of published data for jacketed bullets. Start low work up. So far have not had issues this way expect for unburned powder when the charge was too low. The throat is going to tell you where the COAL needs to be with the particular bullet you are using. I use a lot of IMR4198, it just works well for jacketed and cast.

[roharmon]

I get a lot of data from here: http://458socomforums.com/

[Intel6]

Just need to use the jacketed data to come up with what you like. I found a big consideration was how clean shooting the powder was because it affected the function. I found a great clean shooting load with my standard shooting cast bullet (NOE 354 with GC) using Accurate 1680.

You can see it below along with the NOE 500 gr. SP I use for subsonic shooting.

[dh2]

My 458 SOCOM is an AR-15 so I have to deal with having enough gas to cycle the action , So I am using IMR4198 J-word load data I am having no leading problem

[boman250]

I started a load thread in this other forum. Did not gain a lot of traction. But I posted my data.

https://www.ar15.com/forums/armory/A...com/42-503087/

I have used H335 with the 485 gr HP bullet in this thread and got all the way to compressed charges without major pressure signs. I never tried to use H4895 as it is too slow for this round in my opinion.

H110 is hot burning and gives great velocities but I find that it is hard on the cast bullets and I have gotten leading with softer bullets.

Sometimes, you have to use your experience and knowledge to come up with a safe start load and work up. Be safe. When in doubt, lower the charge weight a bit more. Better to have to pound out a bullet from the barrel than to blow the chamber wide open.

[GSPKurt]

I get a lot of data from here: http://458socomforums.com/

I tried to register, but it tells me registration is closed. Can you please check into that for me? I'd appreciate it.
Kurt

[roharmon]

Not sure what the issue could be, I was just there and it worked for me. What grain round are you shooting? As others have said, use jacketed info for powder coat.

I tried to register, but it tells me registration is closed. Can you please check into that for me? I'd appreciate it.
Kurt

[dkf]

I tried to register, but it tells me registration is closed. Can you please check into that for me? I'd appreciate it.
Kurt

They have had tons of issues with hacking, robo spam, etc over the years.

See this link. http://458socomforums.com/index.php?topic=1529.0