Five cannon propellants were quasi-statically compacted in a 127 mm diameter die/ram set at pressures up to 150 MPa. Some of the propellants were similar in composition to much smaller particle size single- or double-base ball propellants that had been previously compacted in a 25.4 mm diameter die/ram set. Simultaneous measurements of applied and transmitted forces, bed displacement, and outer die wall strain were made during loading, unloading, and reloading (only for two materials). Bed densities at or exceeding theoretical maximum were achieved for each material during loading (and reloading). Thermal softening near maximum density was especially significant for the single-base propellants, which were the most difficult to compact. Beds of nitrocellulose-based propellants momentarily locked during unloading even though the die wall was well lubricated. The dominant compaction mechanism was plastic deformation with the virtual absence of fracture, the same as for the ball propellants. Profiles of axial stress versus density were fitted by a previously-developed model which requires only the initial bed density and the Meyer yield stress (p(y)). For one material, with compressive yield stress (Y) data that could be interpolated for the same strain rate during bed compaction, it was verified that p(y) similar to 3Y. For the nitrocellulose-based propellants, p(y) decreased systematically with increased plasticizer level.