None
The propellant is 33.5 pounds of a double base, cast grain solid with the following composition:
Nitrocellulose 60%, Nitroglycerin 23.8%, Triacetin 9.8%, Dimethylphthalate 2.6%, Nitro diphyenylamine 1.0%, Lead Stearate 2.0%.
Old Chemical Weapons Reference Guide (1998)