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I don't crimp any bottle-neck cases but my pistol cases all get crimped. For my rimmed pistol cases I us the roll crimp in the seating die without a problem. The bullets all have cannelures and the bullets are seated to the cannelure as the crimp is performed. For the rimless pistols I use the taper crimp built in to the seating die. I have only had problems when the cases were different lengths. If the case is too long the bullet is out of place and the crimp will fold or compress the case. If it is short then no crimp (or less crimp) is applied.
Once the cases are the same length it all works well because I run each case through the trimmer which is adjusted to maximum case length. New brass is almost always short but There is little that can be done until they grow. Even my 9mm brass grows through several firings.
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