The present authors examined magnetic properties of anisotropic Nd_10.1Pr_2.9Fe_74.6-Co_5.8B_6.2Zr_0.1Ga_0.3HDDR powders prepared from strip cast alloy flakes which were annealed at various temperatures before HDDR treatment. B_r's and (BH)_max's of the powders are increased with increase in annealing temperature for the starting alloy flakes, which can be ascribed to the growth of original Nd₂Fe₁₄B grains. The bonded magnet of the powder obtained from the optimally annealed alloy flakes, exhibits B_r of 1.05 T, H_cJ of 1100 kA/m, and (BH)_max of 199 kJ/m³, which are much superior to those from the conventional book-mold cast ingots. This would be related to the elimination of α-Fe phase in the strip cast flakes.