Setting up your 366 auto – Hornady 366 AP Loader User Manual
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SETTING UP YOUR 366 AUTO
 Mount your 366 Auto securely toward the front of a sturdy bench. All operations of the press are 
to a full stop, so the operating handle must clear the bench when in the down position. Since the 
shells are ejected down a chute, out the back of the loader, you may want to set your loader up on 
riser blocks (010060) to provide access to the completed shells. An alternate method to catch 
finished shells would be to cut a hole in the bench and place a box underneath. 
 
1. Before filling the shot and powder hoppers, turn the measure assembly upside down and
carefully push the charge bar out and check the powder and shot bushing numbers.
2. Your loader was furnished with standard bushings, 12 GA. 1 ⅛ oz. #7 ½ shot, 468 Powder
Bushing; 20GA. ⅞ oz. #9 shot, 393 Powder Bushing; 28 GA. ¾ oz. #9 shot, 303 Powder 
Bushing; 410 GA. ½ oz. #9 shot, 291 Powder Bushing but double check to insure you will 
dispense the correct weight of powder and shot. 
3. While the charge bar is removed or pushed back, check that the measure casting seals
(rubber washers) are in the recess in the measure casting.
4. Reinstall the bushings and push the charge bar back in place. If the powder slide should
drop out of the measure assembly, do not disassemble the measure plate.
5. Replace the powder slide by pressing it in from the side against the detent spring, pull
spring back and fit into slot.
6. Reinstall the measure assembly by tilting the casting as you slip the measure plate and shot
rotor spring under the hold down washer, and the charge bar into the slot of the charge bar 
cam. 
7. Secure assembly in position with measure attaching bolt.
8. Install the primer tube in the die head casting and fill the primer tray according to
instructions furnished with it. Do not fill the tube at this time.
9. Check the individual stations of the loader for alignment to make sure nothing has loosened
during shipping. Shut off the powder slide (push in) and the shot rotor (pull forward) while 
checking each station. 
 
 
READ THIS SECTION BEFORE ATTEMPTING TO LOAD AMMUNITION! 
 
 
 
 
