No need to make brass.
.38 Super +P brass from Starline pops up pretty regularly on the internet gun-sale sites.

Here's one available right now:
https://www.ozgunsales.com/listing/98561/starline_brass_38_super_100.html

I grabbed some not long ago to make 9mm Browning Long cases for a Husky m/1907. Very good brass by my experience so far, at a nice price. All good!

Coated projies from Hawkesbury River, and others, available all day long.