Working on race car ballast weights, poured lead/wheel weights, a saw does little to cut thick sections. I have tried a sawzall with coarse blade and slow speed, nope. Tried band saw set at slowest speed, nope, tried same with coolant wash, nope! I did not try a chainsaw and probably won't. One way I got through a 4 inch thick 6 inch wide chunk was using an old axe head in the hydraulic press. It pushed it through all right, but not easily. I feel the shearing, wedging, chiseling, chop is the answer on a one inch thick piece. Lead will drill if you get the speed and feed rate right. So I guess you could drill a line of holes to facilitate removal, Or just start melting it into usable ingots and make a day of it. By the way, we no longer use lead, we use solid steel for weight for ballast.