Use two or more if you wish to increase the thickness. Wad Punches Card wads are used over the powder in black powder cartridges. It seems to keep the hot gases from cutting the fragile base of the soft lead bullet. Some BPCR shooters also add a wafer or disc of lube on top of the card wad to aid in keeping the fouling soft. These punches are ideal for cutting out your own wads.
Many shooters make their wads from milk carton or tablet backing.
Punch through several layers against a wood block.