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All brass gets shot twice before any prep so the natural expansion in the flashhole can settle down.
The top two pictures show how the flashhole gets uniformed. In the first picture the collar gets inserted into the primer pocket and the collar has both primer pocket sizes on it then the reamer goes through the collar and uniforms the flashhole.
In the third picture I am deburring the flashhole inside of the case. This is Lapua brass so it rarely has a burr which is common on other brands of brass.
The fourth picture shows the primer pocket uniformer set up for my cordless drill.
Picture five was supposed to show the uniformed primer pocket but the camera flash against the bright brass makes it a mess to see.
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