.357sig pcc

[Todd.K]

Doesn’t CMMG nitride their barrels?

[yoni]

Doesn’t CMMG nitride their barrels?

oops one more thing to check on

[ABNAK]

Wouldn't just swapping bolts and reaming the chamber not address the higher pressure of the 357Sig? i.e. wouldn't it require a little buffer weight and/or buffer spring tweaking?

[ABNAK]

Doesn’t CMMG nitride their barrels?

Yeah that could complicate reaming, especially if you are renting a reaming tool.

[yoni]

I know am reaching out to various barrel makers to find a 9mm barrel that can be rechambered and then try to find a place to nitride it

[robbins290]

After I saw this I bought an aftermarket 357sig barrel for my M&P .40:

The 2nd shock wave reminds me of a mini depth charge

I not a science person, but what causes the second expansion of the gel. with the flash and such? I have never seen that.

[Todd.K]

Nitride isn’t really necessary.

It would be good to get a .40 barrel and copy the feed cone and or radius into the chamber. It may be different than blowback barrels, and I know that it matters a lot on blowback AR barrels for reliable feeding.

Feel free to ask me any tech questions that come up, I used to make AR barrels.

[Todd.K]

I was reading up on some RDB stuff, came across a mention of getting a custom 9mm barrel made.

https://c3junkie.com/?page_id=280

[33XRAY]

I not a science person, but what causes the second expansion of the gel. with the flash and such? I have never seen that.

I'm not either: https://en.wikipedia.org/wiki/Hydrostatic_shock

Excerpt: what is known to hunters as hydraulic shock—a hydraulic transmission of energy which is believed to cause instant death of animals hit by high velocity bullets

You're seeing some crazy shit due to the velocity.

[yoni]

I want to be clear I would NEVER use Critical Defense ammo in 357 sig, they just don't give the penetration needed.

Second I would not use conventional hollow points in 357 sig, if that was all I could get my hands on I would go back to 9mm.

The only round in 357sig that makes sense to me is the Leighi Defense 65 grain from Underwood ammo.

I have ordered a 40S&W bolt from CMMG, and I have found a fellow 357sig follower that is a gun smith and when I get the bolt he will ream my chamber from 9mm to 357 sig.
I will then achieve what I wanted for a PDW and pistol combination.