Winchester Super-X .17 HMR 20gr JHP ammunition is a rimfire cartridge designed for consistent performance and reliable expansion in .17 HMR–chambered firearms. Loaded with a 20-grain jacketed hollow point (JHP) bullet in a brass case, it delivers a listed 2375 FPS muzzle velocity, making it a solid option when uniformity and predictable results matter—because rimfire is a lot more enjoyable when it behaves itself.
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