A couple weeks ago I traded a 9mm P320c that I'd had some issues with for a P320c in 40 S&W. Then I promptly ordered a 357 barrel from Sig. That arrived yesterday, so I took it out this morning to run some ammo through it. I chrono'd 4 different loads. Here's the the 10 shot averages:

Gold Dot 54234 - avg 1278  (a little disappointed with this one)

Federal HST - avg 1321

Remington Golden Saber bonded - avg 1330

Speer Lawman - avg 1246

The HST and Golden Saber velocities were what I expected from 357 Sig in a compact barrel. The gun performed flawlessly, and was very accurate with 357. Recoil was about as heavy as 180gr 40 S&W, but less than 165gr Lawman.

Underwood makes stout .357 Sig loadings, and they're what I have in my EDC gun.