Looks like the pics were shot in 1967 from the SR71, a rimfire simunition![]()
Home-made semi jacketed bullet of some sort, rather than complete cartridge ?
It looks like somebody's own swaging project.
John
Home made bullet for a .45 caliber. Since it is .452 probably for .45 ACP since .458 bullet are required for 45-70. If for .45 Long Colt it might be too small a diameter to be accurate since most .45LC like bullet in the .454 diameter.