So I have 3 shells one appears to be some kind of sniper or rifle cartridge, it has a neck that is in shape with about 10 mm neck width and about 10 cm tall and a 20 mm base it is most likely a 12.7 anti infantry Russian cartridge from 1943, it was found in Poland, it is a centre fire cartridge with LC 43 printed on the bottom. The second one is most likely an anti aircraft cartridge with a 35 mm neck width 25 cm tall and 5 cm base width. At the top of the cartridge there is like a small indent rim. At the bottom it has many letters and numbers and has an indent above the rim. This is also probably a Russian cartridge found in Poland. On the base it says 184-c 239-4 something, 99, 530 The third cartridge is the biggest and the one there is least info about. It has a 76 mm neck width, 38 cm tall and a 78 mm base width. It is a persistent cylindrical shape with a rim with no indents above it, the firing cap (don't know the name of it the circle on the base) has three large holes on the firing cap, the base has some writing on it that isn't distinguishable. On the front it has writing on which raises the suspicion of it being Russian it says 70(then a Russian character that means D) then the only other readable part is 5-22 (the 22 is in a box) I would like to know the purpose of the cartridge, region it came from, what calibre it is and what gun shoots it. Many thanks.