Piece of nylon with deep, medium and shallow holes drilled the boolits diameter
tape penny to bottom of jig under the deep hole to span hole in sizing die
Place boolit in deepest hole and set GasCheck on boolit
set jig in press and press GasCheck on to boolit
place base of GasChecked boolit in sizing die (still in the jig) and seat a deep as possible
switch to medium hole in jig and seat
switch to shallowest hole and seat