Is your question about .357 +P ammo? As far as I know there is no SAAMI spec for 357 +P.
If you are asking about 38 special +P ammo, then you shoot as many of those as you can afford in your 357 revolver.
38 special +P is about 10% more powerful than standard pressure 38 special, but still significantly less pressure than standard 357 magnum ammo.
Shooting 38 special +P in a gun designed for 357 magnum is actually taking it easy on the gun- and the shooter too since the 38 special +P has less recoil.

 

Mine is loaded with 38 Special +P Remington right now.

 

As, I expect, are many snub nose .357 magnums. Especially the lightweight versions. My S&W M&P 340, at 13.8 oz., is a real handful with .357 magnum loads.

 

You most definitely can shoot 38sp +P in your 605. It's a 357. 357 pressures are way beyond 38spl +P pressures.

 

I don't think I would want to shoot a .357+P in my 605. Federal 158 gr .357 is all I can handle and still kind of control the recoil.

 

I currently have double tap 125gr bonded defense in my 605 poly protector. It shoots them easily and recoil to me is moderate. 38sp +p is very manageable in it