Then Pete, you oughta get rid of your beloved (and unsafe?) BLRs. The large percentage of ADs with hammer guns occur when the hammer is lowered on a chambered cartridge and the BLR has no hammer block ......just a half cock notch like all the leverguns made since the 1860's. Did you read the instruction manual that came with your BLR?
"In order to move the hammer from full-cock to half-cock position,
you must first place your thumb on the hammer to restrict its forward
movement. The trigger is then carefully squeezed to release the
hammer from the full-cock notch....
Be careful: If the trigger remains depressed, the half-cock notch will
not catch the hammer should it accidentally slip during this operation.
The hammer would continue past the half-cock position to the
dropped or fired position and the gun could discharge."