The Lee Precision 6 Cavity Block is what you need to produce .358 diameter 140 grain semi wad cutter bullets. These bullets would be suitable for . 38 Special, .38 Colt New Police, and .357 Magnum.

Specifications and Features:
Lee Precision
6 Cavity Block
.358 Diameter
Produces .358 diameter 140 grain semi wad cutter bullets
Suitable for . 38 Special, .38 Colt New Police, and .357 Magnum
Bullet Coefficient .142
Bullet Overall Length: .643 inches
Distance from bullet nose to the top edge of the first driving ring: .295 inches