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I say the same as Unclenick and OHeir.
For pistols you need an taper crimp since the head space has to be correct. I have an Hornady Taper crimp 2 3die set for 9mm Luger and the same taper crimp 3 die set I ordered for the 380 acp I plan to buy (Beretta Pico). I cast my own bullets.
For revolvers I use allway an taper crimp set as well (RCBS 3 die set series B I believe. 38spl/357 mag). No problem whatsoever. I cast my own bullets. I recommend ONLY taper crimp.
In both cases I about undue only the case mouth belling with the crimp.
As I understand roll crimp has to go exactly into the cannelure which may be an hassle since with repeated reloads I realised the cases shrink instead of expand. So trouble may be ahead roll crimping in that case. Taper crimp you seat them were it goes an you are fine if you stay midway below max powder charge. Taper crimp is easier and more foolproof.
If you measure the cases you will notice about no one is the same length. They can vary considerably in legth even if the are fired only once.
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