https://www.milsurps.com/images/impo...IMG_1764-1.jpg
Note flat.
https://www.milsurps.com/images/impo...IMG_1765-1.jpg
Rifling inside...
https://www.milsurps.com/images/impo...IMG_1767-1.jpg
Printable View
I am not an expert, but for the hole in the middle, it seems to me as an Anti-Tank round with a wolfram "needle" in it. For the year, dont know. Now we use "Steel-Needles".
Regards
Gunner