Cross-linked double base propellant having improved low temperature mechanical properties

In a crosslinked composite modified double base propellant composition comprising nitrocellulose, energetic nitoester plasticizer, organic or inorganic oxidizing agents and mixtures thereof, binder prepolymer and isocyanate crosslinking agents, the improvement comprising employing, lacquer grade nitrocellulose containing 12.1% to 12.6% nitrogen as the nitrocellulose source, and employing a mixture comprising polyglycoladipate having a hydroxyl functionality of 1.9 to 4.0 and polycaprolactone having a hydroxyl functionality of about 2 to about 3 in which the weight ratio of polyglycoladipate to polycaprolactone is about 5 to 1 to about 1 to 5 as the binder prepolymer, the percent by weight of nitrocellulose being from about 0.1% to about 10% and the weight of the binder prepolymer being from about 5% to about 25%, based on the weight of the propellant composition.