In agreement with HAZORD, the BDU versions with the spotting charge can be just as nasty as the BLU. Take the 2.75" HYDRA for instance. It contains basically the same VERY sensitive fuze as the war shot, but with a HEALTHY spotting charge. The BDU 76/Mk 33 25lb Practice bomb contains either the CARTRIDGE, SIGNAL, PRACTICE BOMB MK 4 or its Air Force equivalent, which is pretty much a lengthened aluminum shotgun shell filled with a spotter smoke (F/S, Red Phosphorus or White Phosphorus) that gets blown out upon impact. And going to ground side, some 40mm PRACTICE rounds also contain a live fuze with a healthy spotting charge. Many a person, even knowledgeable trained personnel, have gotten "bit" by innocuous seeming "practice" rounds. Sorry to go off on a tangent, but just because it says "PRACTICE" doesn't mean safe. I'll step off my soap box now:tinysmile_twink_t2: Regards, Bruce.