Depends on the powder used. You need regular small pistol for 38 special.

For 357 magnum some powders require a small pistol magnum primer like H110 or Win 296, HS 6 works better also with mag primers.

Any brand will work. Hodgdon Powder lists a Magnum, primer in all their magnum loads for consistency even though some powders like HP 38 do not need it.

If you use 2400 for your magnums you do not need mag primers.

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