s&b 9mm cases always stopped my sdb. Always chunk them, seemed like the primer pockets are tight or whatever, but there is no point in even fooling with them,
As long as it is just the one type giving you fits, it is probably the brass/primer combo. The base under the shell plate can get out of alignment, I had that issue last year and Dillon sent me a tool to align it (free of course!). I'm not sure if the base being out of alignment could/would cause any sort of primer alignment issues that could do this.
If you look at the S&W cases closely you will see that the primer pocket is almost perfectly perpendicular to the base. Most other brass has a rounded surface at the interface of primer pocket and base. I was told that this was the result of S&W reaming their primer pockets rather than swaging them. In any case If you use a bit of extra care in aligning the case and refraining from muscling in the primer you should not experience any problems. S&B produces excellent brass.
This is only happening with S&B cases (.45 ACP), when seating CCI Large Primers. My loader is a Dillon 550B. Any one have similar experience or can tell me what is what?