My 2 favorite .38 Special target loads are:
148gr DEWC over 3.2gr W231
158gr LSWC over 4.0gr W231
A few fairly light .357 Magnum rounds I like are:
158gr Hard Cast LSWC over 5.2gr W231
158gr Hard Cast LSWC over 7.2gr HS-6
For middle-hot .357 Magnum rounds I like this load a lot. It's very accurate, not too hot but you still know you're shooting a .357 Magnum round.
158gr SJSP/SJHP bullet over 14.0gr 2400
There are hotter loads I build but they really aren't for the range.
For a woods carry .357 Magnum round I like a 158gr Hornady XTP bullet over 17.0gr Lil'Gun.
For a heavier load I like 15.0gr Lil'Gun under a
180gr WFNGC Cast Performance bullet. Cost Performance bullets are also used in
Grizzly Ammo. (same company) That same charge can be used under a 180gr Hornady XTP bullet.
These loads might be a bit too much to handle easily from a 2.5" K frame revolver so be careful.
**CAUTION** Mistakes in posting charge numbers can and will happen. Always check the data for yourself.