I am seating large CCI primers using the RCBS hand tool.

1) there is some pressure when seating (leave marks on the primer)
note i do not get the pressure when seating Hornady.
2) the tool is seating them flush without closing the tool all of the way (still about a half inch of travel in the tool
note this is the case with Hornady as well


Any ideas? Is it simply a different size primer pocket due to European Brass?