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The Gun Shots
January 04, 2013
Ammo Review: New .17 Winchester Super Magnum, World's Fastest Rimfire Round - 4
by John B. Snow
Varmints have a new reason to quake in their burrows. Winchester has introduced the .17 Winchester Super Magnum, which is not only going to be the world’s fastest rimfire round, but also one that offers a significant performance increase over the .17 HMR (see charts below). It pushes a 20-grain bullet at 3,000 fps, which is 625 fps faster than the .17 HMR. What does that extra velocity buy you?
For starters, with a 100-yard zero, you get a much flatter trajectory. Drop at 200 yards with a 20-grain bullet is just 4.1 inches, compared to 10.7 inches with the same bullet out of the .17 HMR. Perhaps more important is the .17’s ability to resist the wind, which has always been one of the weaker qualities of the Hummer. In a 10 mph crosswind, the .17 Win. Super Mag. will move 7.3 inches at 200 yards, while the .17 HMR drifts 16.6 inches.
The velocity boost should also translate to more impressive terminal performance at longer ranges. Though the .17 HMR has proven to be a very accurate round, its knockdown power on even moderate-size prairie dogs at 100 yards is just so-so.
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