Report Tanks guns and ammunition. in Ballistics Science Discussion Posted September 19, 2019 10 hours ago, SH_MM said: It is very unlikely that this hypothesis is correct. The effort of launching a "precursor" tip at the pre-determined distance is too much to be viable (not only the volume taken up by the fuze and explosive charge, but also the cable running to the back of the fins will create issues in an APFSDS penetrator). Chances are high that the Master Sergeant doesn't know the exact working mechanism of the round either. M829A4 has essentially same velocity as M829A3 (based on US reports), so the mass will be similar. The tip section is screwed in by hand and it is implied that this is mostly related to the qualification process of the ammunition (otherwise the loader would need to know which tip is best suited for which specific target, which is pretty hard to achieve once autoloaders are added into the mixture). But is anyone able to answer why a new round has suddenly been put on public display? I'd usually expect this to be more tight lipped for another decade at least. Heck even the M829A3 to my knowledge still doesn't have official measurements out.