The .17-357 RG (AKA: .17 Real Guns) is a Center Fire cartridge with a Bullet Diameter of 0.172 in” (4.37mm) that is primarily used in Pistols and Rifles. The .17-357 RG originated in The United States in (UNKNOWN DATE). The .17-357 RG also has a case length of 0.865 in” (21.97mm) and an overall length of 1.26 in” (32mm).
Additional Cartridge Designations: Wildcat Cartridge
The 17-357 RG is the product of necking down a .357 SIG Cartridge to accept a .172″ (4.37mm) Caliber Projectile. The total neck reduction is done over 8 steps, and reduced the case neck by .158″ (4.01mm). The 17-357 RG uses a 20-25 grain bullet, and load depending, is capable of sending a projectile down range at over 3300fps.
The .17-357 RG was created by Realguns.com editor Joseph Alessandro and was tested in the Thompson Contender Single-Shot pistol. Test results and load data can be found at the Real Guns website, and all data listed on the .17-357 RG load data page on realguns.com is marked as being MAX load data for the Thompson Contender pistol and “may easily be excessive in other..” pistols.
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