At the range yesterday: I shot 232 rounds. Only the last 14 were jacketed. Came home and cleaned my 686 and there was no lead to be found.
Given, they were all light rounds. A lot of wad cutters (148g) and cowboy action type truncated cones (105g). So none of these rounds were prone to leading - but given enough rounds . . . you'd think there would be some leading. But if there was, the last 14 rounds cleared it.
I load 9mm, 10mm, 38 Short Colt, 38 Spl, 357 Mag, 44 Spl, 44 Mag, & 45 ACP.