my retired machinist buddy has reloaded alot of the berdan primed cases over the years... by drilling a center hole, & reaming the primer pocket to the closest Boxer primer... ( if I'm not remembering correctly, he may have had to thread in a bushing to fit the boxer primer ??? I hate it when the grey matter starts acting old
)
( I'm not sure, but if I remember correctly, the berdan primers fall between the large & small boxer type )