8×59mm RB Breda

• Name — 8×59mmRb Breda • Origin — Italy, Kingdom of Italy • Type — Machine gun • Service — 1935–1960s • Used By — Italy, Portugal • Wars — * World War II • Portuguese Colonial War • Design Date — 1935 • Production Date — 1935–1960s • Is Si Specs — yes • Parent — unknown • Case Type — rebated rim, bottleneck • Bullet — 8.36 • Land — 8.0 • Neck — 9.14 • Shoulder — 10.80 • Base — 12.49 • Rim Dia — 11.92 • Rim Thick — 1.40 • Case Length — 58.84 • Length — 80.44 • Rifling — 240 or 245 mm • Primer — large rifle • Max Pressure — 3150 atm 46,300 psi • Is Si Ballistics — yes • Bwunit — gram • Bw1 — 13 • Vel1 — 790 • En1 — 4057 • Bw2 — 13.4 • Btype2 — Ball mod. 35 • Vel2 — 750 • En2 — 3768 • Bw3 — 12.57 • Btype3 — AP mod. 39 • Vel3 — 790 • En3 — 3950 8×59mmRb Breda was an Italian heavy arms cartridge. It is unusual in that it is one of the small number of cartridges designed with a rebated rim, meaning the rim of the cartridge is smaller in diameter than the body of the cartridge. The "Rb" in the designation stands for "rebated rim".

8×59mmRB Breda was a caliber created for use by the Royal Italian Army in World War II. The cartridge was originally designed for use in anti-aircraft heavy machine guns like the Breda M37, Breda M38, and Fiat–Revelli Modello 1935. It was also used in the experimental Pavesi M42 semi-automatic rifle. It was introduced in 1935 but is no longer in production today. • Italy manufactured ammunition during the brief period the Breda machine guns were in Italian service. • Albania manufactured ammunition after World War Two to use in Italian machine guns they captured during World War 2.