Help with a subsonic 357 SIG reciepe

[9teenEleven]

I'm shopping for a suppressor for my 357 sig glock. Once I get it, I will need to start loading subsonic rounds. My understanding is that even subsonic, some powders are going to be louder than others. What kind of powders suppress the best, and which of those would work in 357 sig? I am currently using A.A. #9, I've downloaded some round subsonic, but I am seeing two things. 1) much more unburned powder residue, and 2) major muzzle flash. However, cycling in a glock 23 didn't seem to be a problem even with 9.5gr of A.A. #9.

Any help is mucho appreciated. I am good at following load charts, and there don't seem to be any for what I am trying to do.

 

[ny32182]

Get a 9mm barrel; my money is on that running way better than a 357sig ever would... 357sig was never designed to drop the velocity that far.

 

[rcmodel]

Knowing your bullet weight would help?

It would appear AA #5 or AA #7 would almost always be a better choice then AA #9 however.

It would seem your best chance of finding a sub-sonic load with less unburned powder and flash would be achieved with 147 grain bullets and faster powder. The problem might be finding one with a short enough ogive to work with the .357 SIG's very short case neck.

Again, AA #5 or HS-6, or something around those burn rates.

rc

 

[9teenEleven]

I was using 125gr berry plated bullets. I got the velocity to 1035fps. The rounds were plenty accurate so that wasn't an issue at all. I think you are right about the higher weight bullet.

I know the 357 sig wasn't designed for the lower velocity, but after all, it is a 9mm bullet. The glock recoil spring is the same spring in the 357, .40, and 9mm so reliability and cycling isn't an issue either.

 

[JimKirk]

Hornady 9mm XTP 147 grain bullets work well in the 357 SIG.

Never tried subsonic though!

Jimmy K

 

[Lonely Raven]

Sub-sonic .357 SIG? That just sounds like an oxymoron. The round was built for speed!

 

[Peter M. Eick]

147 XTP's are great and exceptionally accurate in my 229 sport. I have played around with 170 grn lead bullets (for 357magnum) but I will not post the loads since they are not sanctioned by any loading manual.

It can be done and 158 SWC's are nice out of the sig.

 

[ReloaderFred]

A lot of people also use the 147 grain load in the 9x19 for use with a suppressor, so there is no reason why it wouldn't work with the 357 Sig round. Look at some of the starting loads for the 147 grain bullet in 357 Sig data. That would give you a place to start.

Hope this helps.

Fred