Frankford Arsenal Perfect Seat Hand Primer - 110006 The Frankford Arsenal Perfect Seat Hand Primer allows you to easily seat primers from anywhere. It features a dial that sets the seating depth and a hard stop that ensures the primer is never seated deeper than what you want. It comes with 12 shell holders which will cover 652 calibers, a primer tray that holds 100 small or large primers and a heavy-duty injection molded storage case.