I'm having trouble with the concept that when a cartridge is stripped off the magazine, and impacts the feed ramp enough times to set the bullet back, any original "seal" would still be in place, and prevent any contamination of powder or primer. Such an impact would be angular, and would tend to tilt the bullet, within the case, thus diminishing any possibility that any sort of "seal" might remain intact.

Nobody's mind will be changed here.... so be it.