Hi 93x64mm. I don't know much about the Lee Medford but it is my understanding that it utilized rear locking lugs. The Remington Lee uses 2 front locking lugs on a removable bolt head. As Marrakai alluded to, the a latch needs to be rotated to remove the locking pin. The bolt is then withdrawn rearward and the head is removed out of the action. The action is a cock on closing type.
Marrakai, please share some pics of your Lee.