BaCo(2-x)Mn(x)Fe(16-2y)(Zr-Cd)(y)O(27) (x = 0-0.5 and y = 0-1.0) hexaferrite nanocrystallites of average sizes in the range of 33-42 nm are synthesized by the chemical co-precipitation method. The synthesized materials are characterized using different techniques including X-ray diffraction (XRD), energy dispersive X-ray florescence (ED-XRF), scanning electron microscope (SEM). Mossbauer spectrometer and vibrating-sample magnetometer (VSM). Based on analysis of the data obtained from Mossbauer spectral studies, doping is believed to have occurred preferably in the vicinity of 12k sub-lattice, i.e. f(IV) (4e, 4f(IV)), 2b (6g, 40 and 2d site. Variations in the saturation magnetization (77.1-60.9 emu g(-1)), remanent magnetization (22.08-31.23 emu g(-1),) and coercivity (1570.1-674.7 Oe) exhibit tunable behavior with dopant content and therefore can be useful for application in various magnetic devices. (C) 2011 Elsevier Ltd. All rights reserved.