Magnum JHP loads, 357, 41, 44mag. 2400 powder.

Leadcast loads, 38 spec, 357, 41, 44 mag. Unique powder.

There's been lots of talk here in the past about flame cutting / torch cutting the throats on the barrels when hotter loads are used.

My most accurate 357 magnum load is the Speer 140gr JHP with 2400 powder in my 6" barreled Python.