.17 HMR
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.17 Hornady Magnum Rimfire, commonly known as the.17 HMR, is a rimfire rifle cartridge developed by Hornady in 2002. It was developed by necking down a.22 Winchester Magnum Rimfire case to take a.17 c
17-grain (1.1 g) A Sellier and Bellot .17 HMR round with a light green plastic tip.
Left: .17 HMR, Right: .22 WMR
A .17 HMR cartridge with a ballistic tip (left) compared with a .22 LR cartridge (right)
A case of .17 HMR rounds with hollow points
5mm Remington Rimfire Magnum
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The 5mm Remington Rimfire Magnum or 5mm RFM is a bottlenecked rimfire cartridge introduced by Remington Arms Company in 1969. Remington chambered it in a pair of bolt-action rifles, the Model 591 and
.17 HMR
…who worked to create a rimfire cartridge with an exceptionally flat trajectory. These wildcatters were seeking to match the ballistics of the obsolete 5mm Remington Rimfire Magnum, which was made from 1969 to 1974, and was the fastest rimfire cartridge ever produced at the time. With 5mm (.204 in) bore barrels and diameter bullets…
5 mm RRM (left), .22 WMR (center) and .17 HMR (right).