Just wondering if anyone has tried it (the JHP variety), if so your likes and or dislikes and pros and cons. I found some for what seems to be a fairly decent price and thought I would give it a try.
+1 on Underwood ammunition. Their .357 Sig load with the Speer 125 grain bonded hollow points is very strong and an amazing choice for self defense. Their FMJ or Extreme Penetrator cartridges are excellent in the field.
As for Sig Sauer ammo; I've used it in some calibers and I find it to be middle-of-the-road. The .380 cartridges didn't feed well at all and the hollow point hung up on the feedramp occasionally.
Bullet set-back with decently made ammunition is only a factor if you load and unload your pistol frequently without rotating what cartridge goes in the chamber. Those bottlenecked cartridges feed into that funnel-shaped chamber beautifully...and more reliably than straight-walled varieties. In the twelve years that I have owned .357 Sig pistols, I've never had a failure...of any kind.