I posted this in another forum earlier today.
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. I've got other boxes of Gold Dot with different lot numbers. I'll test those and see how they compare. 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.