The work includes manufacturing and characterization of uncured and cured gun propellant compositions, consisting of FOX-7 and poly(glycidyl azide), also known as Glycidyl Azido Polymer (GAP). Burn rate measurements of the propellants have been performed in Crawford and EMBLA vessels, at low and high pressures and at different temperatures. The purpose was to examine the temperature sensitivity of FOX-7 and the influence of particle size on the burn rate of FOX-7. A number of uncured and cured FOX-7/GAP gun propellants were manufactured and characterized by particle size, curing behaviour and mechanical properties. The temperature sensitivity of FOX-7 was not possible to evaluate with the basis of received results, but it was on the other hand possible to show that the burn rate of fine FOX-7 particles (18-60 µm) was higher than for FOX-7 particles of the sizes of 46-126 µm, in the pressure interval of 50-350 MPa and at a temperature of 20°C, which could mean that FOX-7 is showing the same burn rate behaviour as pure ammonium perchlorate (AP) propellant of the same particle sizes does, at low pressures.