6.45×48mm XPL Swiss (or 6.45×48 GP 80) is an experimental intermediate rifle cartridge.
It was developed as part of the WEIZE trials (Weiche Ziele, lit.
"soft target") in conjunction with the SIG SG 550 rifle, as a potential successor to the 7.5×55mm Schmidt–Rubin cartridge.
[1] The rimless cartridge has a base diameter of 11.82 mm (similar to the 7.62×51mm NATO) and a case length of 47.72 mm.
The cartridge was not adopted, the SIG SG-550 went into production with the 5.6×45mm GP 90 round.