New primer feed. The MEC 650N gives maximum performance with a minimum of effort. It works on six shells at once. With every stroke, a reloaded shell is completed. The MEC 650N does not resize except as a separate operation. This is the ideal press for the person who wishes to resize and inspect their shells as a separate operation. The MEC SuperSizer is recommended to fill your resizing needs. The MEC 650N has three crimping stations. The first station starts the crimp. The second closes the crimp. And the third station places the taper on the shell that is so important for proper feeding in a pump or automatic.