bear; I have never had any problems with lead bullets not being held firmly by a taper crimp. While there is nothing wrong with using a roll crimp, be aware that the crimp will then be dependent on case length, so you must maintain a uniform case length.
If I were to hazard a guess as to why your lead bullet is not held firmly by a taper crimp, it would be that the expander plug on the decapping/expanding die is a few thousandths too big in diameter. Walt
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