I reloaded some lead bullets for my sigma and due to the shape of the bullet I had to seat them shorter than FMJ. The fatter nose on the lead would hit the rifling and not let the gun go completey into battery. They were a PIA to get them out of the gun when it jammed.
I would surely try some before I loaded in huge quantity. Ask me how I know. Your sigma may be different than mine. They shot well enough once I got them short enough but I only shot steel plates and did not try for groups.
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