6.5×52mm Carcano

The 6.5×52mm Carcano is the rimless bottleneck rifle cartridge Italy adopted in March 1890 for what became the Model 1891 Carcano rifle, developed under Italy’s Commissione delle Armi Portatili after that body’s Reale Laboratorio Pirotecnico di Bologna tested bullet diameters from 6 to 8mm. Major Antonio Benedetti of the Brescia Arsenal argued successfully for the smaller-bore option, and the cartridge was standardised a year before the rifle built around it. Italy’s original propellant loading proved too hot-burning and unstable in the field, and after testing several alternatives, including a British option, the state’s own explosives works in Liri developed a new, more stable formulation that was adopted in 1896 and remained unchanged for the rest of the cartridge’s military production.

The Carcano round was the first of a family of comparable small-bore military cartridges adopted by several European armies around the turn of the twentieth century, a group that also includes Japan’s 6.5×50mm Arisaka, the Dutch and Romanian 6.5×53mmR, Greece’s 6.5×54mm Mannlicher–Schönauer, Sweden and Norway’s 6.5×55mm, and Portugal’s 6.5×58mm Vergueiro. Its rifle’s adjustable rear sight was graduated for volley fire out to 2,000 metres, reflecting the massed-fire infantry doctrine of the period rather than a claim about aimed accuracy at that range. It remained in Italian service from 1891 until 1970, seeing use in Italy’s colonial wars, both world wars and the Spanish Civil War, and it was also used by Finland and by German forces that captured Italian stocks during the Second World War.

The dimensional and pressure figures on this page come from C.I.P.’s datasheet for the cartridge. That sheet publishes no velocity, so the two velocity points here, one for a full-length rifle barrel and one for a carbine-length barrel, are the uncited figures from the encyclopedia article and are recorded as estimates. No manufacturer’s current factory-ammunition velocity was found.