FWIW, I've loaded 39 Sierras, 40 Hornadys, and 40 Noslers all with the same load/charge, and suffered no ill effects, though my rifles won't shoot that lonnnnnggggg Hornady worth beans. Danged shame, but the Sierras, being shorter than the other two, shot best, My two .204s have always preferred the shorter 32s.
