The original PMC Ultramag load in 38Spl did use a brass alloy bullet that was declaired armor piercing by BATF. The 2nd Grn loading in 38Spl and 44Spl used a copper bullet to get around the AP designation.

This Tubular ammo is highly collectable and you can probably get $50-60 for a box or $2 per round if you can find the right people to buy the ammo a single round at a time.