No, from tests we(SSAA Lever Action) have done, even a slightly pointed projectile is safe, as long as it is lead, as the strong primer cup needs a "specialised" hit for it to go off.In most tube magazines the rounds are offset anyway and a huge "bear load" would be required to get anywhere near the critical force for a chain fire in a tubular magazine such as a Rossi or Winch/Marlin.
Try an experiment yourself with an old case in a vise and ear/eye/hand protection when you hit your held, slightly pointy projectile upon the primer with a hammer!
We only found it ruined the case.
Makes your aim a lot better to know such things are safe before the match !!(see ssaa.org.au for our website).