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Highest Rifle Velocity
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13109 ft-lbs in .50 BMG


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.17 Mach IV

Introduced by the O'Brian rifle company of Las Vegas, Nevada, this cartridge was intended to offer simple case conversion and good ballistics. It succeeded on both counts but could not compete against factory chambering, i.e. the 17 Remington. This short cartridge can be used in short rifle action rifles. Efficiency is much better than the various full powder 17's available. This diminutive chambering can produce over 3850 fps with 25 grain bullets and is fully capable of delivering good varmint accuracy to about 250 yards, perhaps a bit further on a calm day. Muzzle blast is in a different league from larger 17's and the various high performance 22's. 

This text is based on information from “Cartridges of the World”, Hodgdon reloading manual, the cartridge designer and/or own resources.

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reloadersnest interactive Reloading Manual is a 5x8" printed reloading manual in Wire-O binding. The manual contains all loads found in this caliber and are regularly updated.

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The Complete Reloading Manual is a compilation based on all rifle calibers with at least one load from this site.
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