Bi(Pb)SrCaCuO thin films containing a high ratio of Pb (0.9<Pb/Bi<1.5), about 0.5μm thick, deposited on MgO (001) by RF-magnetron sputtering have been assessed as a function of their initial atomic concentration. It was found that Bi-content of 1.4<Bi<1.8 (normalised to Cu:3) in as-deposited film may provide almost single phase Bi-2223 thin films with Tc values running from 105.5 to 109.5K (for the Bi ratio of close to1.8 Tc is 106K), and Jc>104A/cm2 at 77K. It was also found that the Bi-content should be below 1.9 or lower than the Sr-content to prevent peeling off of the film during the high temperature annealing process, while Sr/Ca ratio remains around 1 in this heavily Pb doped initial film composition. Although the Pb/Bi ratio is not critical in the range studied when it is above 1.3, slow heating and cooling rate (1°C/min) is necessary to prevent the retention of excess Ca2PbO4 causing poor microstructure in the film.