Remington has offered SJSP, JSP and SJHP loadings for the 357 Magnum cartridge in 110 grain, 125 grain and 158 grain going back almost half a century now. It is just more common to fins Hollow Points stocked on the gun stores shelves these days

The Remington/UMC JSP loading in 125 grain is a nice Performer.

As already stated a JSP does not expand as much or as soon as a JHP of the same weight and construction. However, JSPs absolutely do expand. If you are in need of a non-expanding load than you want to use a FMJ

JSPs are usually better suited for taking game as opposed to personal defense. Unless of course you need to shoot through a door

I have chronographed this Remington factory load from many different firearms. Most velocities listed below are from 2 or more strings of five shots averaged from 2 or more different examples of the same model firearm

From the 2 1/8" Model 640 this load hits an average of 1242 FPS. Not too bad for a pocket gun

The 2 1/2" 19/66s hit 1287 FPS

The 3" Model 60 Pro yields 1298 FPS while the 3" Model 60 Small Hunter gave us 1322 FPS

In the 4" Model 27 it averages 1391 FPS.

From the 5" 627s this hit 1496 FPS as the average

The 10" T/C Contender hit 1776 FPS.

Someone mentioned a rifle. In a 18" 1892 lever action the round achieves 2049 FPS

So the factory claim, is not too far off from reality

I also hand load the 125 JSP in the 357 Magnum Cartridge. This is one of my favorite weight projectiles to shoot. Over the decades I have gone through many tens of thousands of this load in various firearms.