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.17 Mach IV

Rifle cartridge

Rifle cartridge

FieldValue
name.17 Mach IV
image17MachIV.pngimage_size = 300px
captionLeft to right: .17 HMR, .17 Mach IV, .243 Win
originUnited States
typeRifle
designerVern O Brien
design_date1962
parent[.221 Remington Fireball](221-remington-fireball)
case_typerimless bottlenecked
bullet.172
neck.206
shoulder.361
base.378
rim_dia.378
rim_thick.045
case_length1.400
length1.830
rifling1 in 10 in
primerSmall Rifle
bw225
btype2HP
vel23680
en2797
bw325
btype3HP
vel33890
en3849
balsrc6mmBR
Hodgdon<ref name"hodgdon"

||number=

Hodgdon

The .17 Mach IV / 4.4x35mm is a wildcat centerfire rifle cartridge, based on the .221 Remington Fireball case, necked down to fire a 0.172 in bullet. The cartridge was introduced in 1962 by Vern O'Brien. The cartridge offered an easy case conversion and good ballistics, but could not compete against the .17 Remington.

The name, Mach IV, comes from the claim that the bullets can reach 4000 ft/s. Due to the relatively small case capacity, even small variations in powder of 0.5 gr can lead to the difference between a safe and dangerously over pressure load. Aftermarket barrels for the XP-100 pistol were sometimes marked ".17 Mach III" due to the lower velocity produced by the shorter barrel.

The .17 Mach IV became very popular with varmint hunters, so much so that in 2007, Remington introduced its own very similar version, the .17 Remington Fireball.

References

References

  1. "17 Caliber Wildcats".
  2. "Hodgdon Online Reloading Data".
  3. Barnes, Frank C., Cartridges of the World, 7th Edition, p171
  4. Jim Saubier. "Which .17?".
  5. [https://www.handloadermagazine.com/wildcat-cartridges-8 Wildcat Cartridges: .17 Mach IV] Column by Layne Simpson in ''Handloader Magazine''
Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

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