cast for .357 SIG

[jessdigs]

I am not an experienced reloader/caster but the only cartridge I own but don't reload for is the .357 sig out of about 10 cartridges. The two reasons for this are the neck tension thing and my perceived risk of the .40S&W case bulge issue going on with the .357 sig cartridge. A visual inspection of my factory glock .357sig barrel shows it is definitely not supporting the case in the same way the .40S&W guys worry about for that cartridge. You may want to read up on this if you haven't already. I am sure there is a safe way to do it, but I know it is a much more risky round to reload than average due to these two factors.

I figure I'll reload it someday, but only after i learn the ropes on the more forgiving cartridges.

What gen is your Glock?

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[justindad]

Greetings! I love an ongoing conversation!

I am looking to develop a cast load for the 357 Sig in a P229. Based on what I've recently read, the Lee 358-125RF sounds like a usable bullet, which will be powder coated. I have seen loads referencing the use of AA9, AA7. and Unique. I understand not posting charges, but I have a minor problem. I haven't been able to find any sources for data using cast bullets. Can someone that is loading cast bullets in the 357 Sig point me towards a reliable source of data, or share a safe starting load for the above powders?

As always, thanks in advance for your help!

Ramshot has some load data for lead in a .357 SIG.

https://www.ramshot.com/wp-content/u...ide8.0_WEB.pdf

[44Blam]

I shoot the Accurate 35-125YG in my glock (with KKM barrel) and with a full case of AA#9, I'm sending those pills in the 1400 fps range.
I also use this same boolit in my 350 legend and am sending it in the 2500 fps range under a solid charge of W296...

[justindad]

The .357 SIG seems like it should use PC boolits instead of lubed. The lube groove can take up a lot of the neck length, if you happen to be able to keep the lube groove out of the powder (is that critical though?). I’m tinkering with lubed boolits, and I’ve used the 125 grain bullet from Hunter’s Supply with good results... but I still suspect that PC will ultimately be my choice here.

[Glwenzl]

Thanks to the contributors of this (older) thread, I’m just now going down this road.

[worker]

@dansedgli (sorry, I know this is an older post) -- but what mold are you sing for these 171s?
Also what powder charge, and is it powder coated, gas checked or plain?

I am interested in heavier weight setups for this, that's why asking
(I am using starline brass)

I shoot 171 grain projectiles in mine.

Very accurate out of a 2011 handgun.

I just use 40 cal brass necked down.

[Krh1326]

Did you guys see the other post, that LEE dropped a new 356-147-TC mold?