Swagged bullets are mostly pure lead, and are not intended to shoot but slower target loads. In a 38 Special if you keep the velocity under about 700-750 fps you will get a very accurate and non leading load. If yo want to get up over 800 fps and into the 900 fps range, you need hard cast bullets. Loose rule of thumb, if you can cut a crease in a bullet with your thumbnail it's too soft to push hard.

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H Richard
SWCA1967 SWHF244