Here's how I make my 20 gauge tube jacket slugs. Got a lot of inquiries on how to make them. So, here ya go. Right or wrong, this is how I do it.
Materials, 5/8.050 wall copper tube, and pure lead cores.
1. Cut tube to prescribed length.
2. Place tube in jacket end rounding die, and close up one end with press.
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3. Reduce jacket through sizer die.
4. Flatten end of jacket
5. Insert lead core and swage to expand core in jacket.
6. Point form nose.
7. Now at this point, I can use slug as is, but I've been having a problem with the slug riding over a roll crimp an tearing the hulls. So I made a punch to press a step (roll crimp ledge) into the nose. Kind of like a modified semi-wadcutter. Last pic looks like a fmj (just the lighting) about 3/8 inch of exposed lead on nose.
These slugs weigh 440 grains, I think I've got everything. Thanks D