OK, I see what's going on here.
First of all, they're saying not to exceed 1,450fps with a 158grain load. Referring to the ever-handy table of bullet energy published by NAA:
http://www.naaminis.com/energy.html
...we see that a 158 pulling 1,450 delivers about 735 foot/pounds of energy.
So, to get that much energy out of a lighter round, you gotta make it go faster - a 125grain round doesn't hit that same horsepower level until it's doing over 1,600fps.
HOWEVER: there's a separate issue, in which lighter bullets do more harm than heavy ones for the same energy level...because the lighter bullet is moving faster as it hits the constriction at the back of the barrel. So the hottest 125grain factory loads you'll find available are driven at around 1,400/1450fps tops...and that's the Remington I think.
I wouldn't shoot a whole lot of those particular rounds (maybe 12 per range session for the first half-dozen or so sessions so you know what they're like) but they're damned good carry ammo if you can handle the recoil, and are on the high end of what that gun can digest.
What I'd stay away from is the super-hot hunting loads as sold by Cor-Bon and others, featuring 180 and 200 grain solid lead hardcast slugs at some serious velocities. Or the 158 hardcasts at 1,500+ available from smaller ammo houses. The only time you'd consider those is if you head to the woods, need to defend against black bear and you just don't own anything else. Recoil will be pretty wild, but the gun should be able to handle a very small diet of these monsters. Too many, and it won't "blow up", it'll just slowly "stress" the gun (stretch key bits like the frame
).
For practice fodder, both .38Spl and .38Spl+P ammo will put very little stress on a stainless mid-sized .357 such as yours.
If you try out some "full house combat 125grain JHPs" such as the Remington and find the recoil is out past what you want to deal with, no problem, go find some Pro-Load 125grain "Tactical lite" fodder. This stuff is basically somewhere between full .357 and .38+P horsepower levels, with a bigger JHP cavity designed to open at the slightly reduced speed. A lot of people with SP101s and J-frame-sized .357s (smaller than your gun) swear by that fodder as carry ammo.
Glasers won't stress your gun at all, even in .357. Due to their price, you won't be shooting many anyways. I would recommend the "silver nosecone variant" with it's larger shot size, as it'll punch deeper than the "blue tip" small-shot formula. In silver .357, I think these are a damned fine choice. Since the bullet weight is only 80 grains, it can be driven faster than 1,450 and still not come close to the energy ceiling Taurus is recommending. And given that they're not completely solid (compressed lead pellets inside of copper foil) I'd be willing to bet that the "impact stress" at the rear of the barrel will be abnormally low.
I'd use .38+P of some sort for pretty much all of my practice. You want enough recoil that you practice lining up the next shot as you come down from the recoil of your last, but not stress you or the gun too much for comfort.
