Charlie
I don't reload for the 380 - but have a thought about your question.
Defense ammo. Can you buy the same bullet the factory uses for your defense ammo of choice?
If answer is yes, then load that bullet to the same OAL of the factory load. Use a moderate to upper power listing of any appropiate powder and Voila! you have a reasonable cost practice load that functions your gun like your defense ammo.
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