Nothing wrong with just loading the long .357 cases for the weapon.

In my 686 6" a " .38 special load " in my weapon tested out at;

110 Jhp Red Dot 945fps to 1305fps with Unique powder.
135 Jhp Unique 860fps to 1035
158 Lwc Trail Boss 755fps to 1014 with Unique

Sorry, I do not shoot the 148gr out of my 357 Magnum revolvers, which are reserved for my J frames.

I do not hot rod the little 110 Jhp in my .357's and seldom use them even from the 1254
to over 1500fps that I did test out.

The 125 Jhp is the minimum weight that I think, works in this weapon from a full load of w231/CFE
fast powders to SR4756 and IMR2400 for loads from 1450 to 1500fps.

158 Lwc loads starting with Trail Boss around 790fps for target work
up to 1100 to 1200fps Unique powder loads for longer range work to
full loads around 1320 for hunting but these may start leading the barrel.

The 158 XTP bullet with IMR2400 can get up to 1340fps as a second choice for a hunting load.

For general plinking loads with a Jacket coating you might try down loading the Hornady 140 gr bullet.
They shoot great in my revolvers and the price is right.

Ps;
with a .357 case you are actually shooting a "Reduced" 357 load, not a .38 special load.
Carry on.