17 Mach IV
Historical Notes:
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.
General Comments:
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. While by no means "quiet", the 17 Mach
IV generates so much less report that this difference is significant. Use
of the faster burning powders listed, while necessitating a slight velocity
sacrifice, results in much quieter loads. Since it uses significantly less
powder than the 17
Remington, the 17 Mach IV generally produces much less barrel fouling,
an important consideration in this diminutive bore size.
Source: Cartridges of the World
| 17 Mach IV Reloading Data | ||||
|---|---|---|---|---|
| Bullet (grs.) | Powder / (grs.) | MV | ME | Source |
| 25 | 2400 / 13.1 | 3600 | 720 | Hornady |
| 25 | H4227 / 14.6 | 3700 | 760 | Hornady |
| 25 | H4198 / 15.6 | 3700 | 760 | Hornady |
| 25 | 2015BR / 18.5 | 3850 | 820 | Accurate |
| 25 | 2230 / 20.3 | 3861 | 825 | Accurate |
| 25 | 2460 / 20.5 | 3883 | 835 | Accurate (Compressed) |
| 25 | 2520 / 20.5 | 3768 | 785 | Accurate (Compressed) |
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