I have used 38 Special data, right out of my manual's 38 Special section, in 357 Magnum brass. I've used many 38 Spec. loads with 150 gr. DEWC in 357 Mag. brass and had no squibs. Just realize the velocities listed in the 38 data will be faster than the same loads in 357 brass.
FWIW. Develop safe reloading habits now, right from the beginning and you can use any powder you feel is suited to the caliber you're reloading. I had a squib from no powder in a round in '70 (I had been reloading for just a few months) and since then I have looked in every case I charged with powder to make sure there is powder in there and it isn't a double charge. I choose powders that perform best in my reloads, not how bulky they may be...
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