RCBS Mini Grand Instruction Manual - Manual (Page 11)

Hole in the middle of the crimp – not enough crimp start. Adjust Crimp Start die down in ¼ turn increments until desired
crimp is achieved.
Concave crimp – not enough spring pressure. Adjust nut above the spring to increase spring pressure at station 6.
Peaked crimp – wad not seated deeply enough or too much spring pressure at station 6.
Inconsistent shot charges or shot dispenses when the Charge Bar Handle is cycled to the left. This is a bridging issue.
Typically too large a size shot is being used. Shot larger than #5 requires the Steel Shot Conversion.
Bulge at mouth of hull – too much crimp start.
Hull buckled – wad not seated deeply enough and/or too much spring pressure at station 6. The shot column is too high
and is not compressible so the side wall of the hull buckles.
Loaded round does not feed in a semi-automatic or pump shotgun. The use of the optional Taper Crimp Die is necessary.
TAPER CRIMP DIE
To ensure proper functioning in a semi-automatic or pump shotgun, the optional Taper Crimp Die assembly may be
required. The taper Crimp Die provides a more radiused hull mouth for smoother feeding.
This assembly is installed at the empty Station 7 of the Mini Grand. Thread the assembly completely into the press and
loosely install the 5/16” Jamb Nut. Insert a loaded round into Station 7 and lower the Handle completely. Lower the
assembly over the loaded round with finger pressure. Raise the Handle and adjust the assembly down a further ¼ to ½
turn. Cycle the Handle and check for the desired amount of taper. Raise or lower the assembly as necessary and tighten
the Jamb Nut.