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ive noticed that even factory 9mm at .355 diameter sticks out of the chamber a bit until the slide knocks it in just as my cast bullets do. is there anyone with experience in this?
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Are you saying they won't seat on the case mouth and are seating the bullet against the lands/cone? If so, that can cause big pressure spikes depending on the load and powder.
If the cartridges will drop into the naked bbl chamber and seat on the case mouth with a "clink" and drop out when you turn the chamber down, then they aren't hitting the lands.
"Short cases" may not seat on the case mouth when feeding, but shouldn't be contacting the lands, leade or cone.
Usually hollowpoints, flat nose or conical nose bullets loaded too long for the pistol's chamber are the culprits causing this sort of problem. Most pistols using fmj ball (or lead with the same shape) will load and feed with "load-data oals"/long.
My CZ won't feed some hollowpoints/flat point using load data oals or some factory ammo. It has a shorter chamber than many.