All shot cups have pre-slit petals, an oval compression unit and can hold up to 42 grams of Lead shot. The Magnum can also hold 28g of Steel shot up to a maximum Ø of 3.5 mm.It can also be used with ITM, ITX, or Tin shot.
H-12 can only be used with Lead or compressible types of shot.
12ga Gualandi G-Magnum ideal for 70mm PT cases holding 40grams of Lead Shot or 40 grams of ITM or 28grams of Steel Shot.