Here are the 3 types of wadcutters. Solid base can be loaded like any solid base bullet to high magnum velocity and usually have a crimp groove. Hollow base WC's are for target shooting only and must be loaded to lower pressure as high pressure will expand the skirt tight in the chamber or bore either blowing out the center of the bullet or leaving the skirt in the bore to become an obstruction for the next round.
Factory loaded wad cutters are usually the hollow base type bullets and are seated flush.