The two main types i know of, one is rolled crimp and and then the normal shotgun shell star crimp (not sure what proper name is) and you can poor wax in the end to hold slug in.
I found roll crimper hard to get, so made my own
Brought a Galvanised Round Plug for steel plumbing pipe from local hardware, then drilled a hole in the centre, found some 10mm round bar and put it in the hole and a tac weld to hold in place.
Can put in drill and just press down on shell softly till it rolls the edge over and hold longer for bigger crimp.
May not be perfect but works and costed like $3 plus 15 minutes of my time..
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