8.5mm Mars

The 8.5mm Mars is an experimental centerfire pistol cartridge developed in the late 19th century based on necking down the .45 Mars Long case. The bullet has two deep cannelures, and the case is crimped into both. The case mouth is chamfered on the outside to fit flush into the forward cannelure. This elaborate bullet seating was necessary to withstand the violent feed mechanism of the Mars Automatic Pistol. The cartridge headspaces on the shoulder adjacent to the neck. The case has a thin rim and deep extractor groove in comparison to most rimless pistol cartridges. There was a very similar 9mm Mars cartridge firing a 156 gr bullet at 1,400 ft/s (430 m/s). The Mars cartridges were publicized as the most powerful handgun cartridges through the early 20th century; but fewer than 100 pistols were made and manufacture ceased in 1907.

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pistol cartridge, Kynoch, 
.38/.45 Clerke, .451 Detonics Magnum, .475 Wildey Magnum, .50 Action Express, .50 GI, 10.6×25mmR, 11.35mm Schouboe, 6.5mm Bergmann, 6.5×25mm, 7,65×25 Mannlicher, 7.65×21mm Mannlicher, 8mm Roth-Steyr, 9mm Mars, 9×23mm Largo, 9×25mm Dillon, Astra 3000, Astra 4000, Beretta 318, Bernardelli P8, Calico M950, Campo Giro, Coonan .357 Magnum, CZ 122 Sport, Gustloff pistol, HK P10, HK P9S, Hämmerli X-Essen, PAMAS G1, Pardini SP, Pistole vz. 24, Safari Arms Matchmaster, TOZ-35, Walther GSP, Walther TP, 

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Frameless

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