.20 Extreme

Cartridge Data Published On: January 20, 2015 at 10:23 pm by Bullet-Blog and last updated on January 20, 2015 at 10:35 pm



The .20 Extreme is a Center Fire cartridge with a Bullet Diameter of 0.204 in” (5.18mm) that is primarily used in Rifles. The .20 Extreme originated in (UNKNOWN ORIGIN) in (UNKNOWN DATE). The .20 Extreme also has a case length of 1.545 in” (39.24mm) and an overall length of 2.05 in” (52.07mm).

Additional Cartridge Designations: Wildcat Cartridge.

Cartridge Details

  • Cartridge Type:
  • Application:
  • Bullet Diameter:
  • Neck Diameter:
  • Shoulder Diameter:
  • Base Diameter:
  • Rim Diameter:
  • Rim Thickness:
  • Case Length:
  • Overall Length:
  • Primer:
  • Rimless, Bottleneck
  • Rifles
  • 0.204 in” (5.18mm)
  • 0.228 in” (5.79mm)
  • 0.348 in” (8.84mm)
  • 0.3725 in” (9.46mm)
  • 0.372 in” (9.45mm)
  • 0.045 in” (1.14mm)
  • 1.545 in” (39.24mm)
  • 2.05 in” (52.07mm)
  • Center Fire (Small Rifle)
The .20 Extreme pistol cartridge has a case overall length of 2.05 inches.


.20 Extreme Rifle Cartridge Dimensions show in Inches & MM


[accordion title=’INCONSISTENT, MISSING or INCORRECT DATA’ open=’false’]INCONSISTENT, MISSING or INCORRECT DATA: If you find information here that you believe to be incorrect or missing please report any findings and references you may have as to what corrections should be made to library@bullet-blog.com. Please note your username in the email.

NOTE: This Firearms Cartridge Library is currently in BETA and may not contain complete information or data. The data displayed here by Bullet-Blog is for information use only and should not be used as a reference for reloading live ammunition. When consulting the information on this site or any other information source regarding firearms or ammunition, always compare information against a second or third reference such as a trusted industry authority or reloading manual. Use information here at your own risk.

* Relative to ruler-scaled image above. Size will vary by screen and device used for viewing.