So you've pulled the handle on brass with spp and it didn't go boom? I run the sdb also and that is my biggest fear. I check every piece of brass but I'm always a little concerned a small primer brass will slide through. I always assumed it would go bang.
Mine has never went bang. Very annoying though.
Same experience here. Primer didn't go off just because the second I felt a weird resistance I stopped. Kinda like if you find a berdan primed 9mm and the press goes thud (unless your decapping rod shatters)