This paper describes the contact copying of volume phase transmission gratings. Master gratings are written in silver halide since this material is well understood and relatively simple to use. Masters are then copied into either silver halide, primarily to characterise the copying, or into DCG for a high efficiency end product. The gratings are characterised in terms of their diffraction efficiency as a function of the angle of incidence of a collimated monochromatic beam. Results are presented for copies in silver halide and DCG to demonstrate the quality of the copy process.