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Due to the wide variety of ammunition available in the .357 Magnum caliber, we recommend using Federal or Magtech 125 or 158 grain JACKETED ammunition. Other ammunition can be used, but some setup of the firearm might be required.

It may or may not fit, some modification to the Mag well may be required. Contact us for more information.

Quoted from Yahoo Answers:“357 Sig set out to match ONE specific loading of 357 magnum in a relatively short barrel, and came close. However, you move beyond that one loading and the 357 Sig cannot compete any more, especially with heavy bullets of 140 grains and beyond”.

See the full response …here

See the photo below comparing the size of a Coonan .357 Magnum Automatic with a standard 1911 pistol.


357 _ 45 size comparison

Higher power .38 Special ammunition will cycle in your Coonan Classic simply by changing the recoil spring. The magazines will accept both .357 Magnum and .38 Special cartridges with no spacer required.

Compact and Compensated pistols will chamber and fire .38 Special cartridges but will not cycle them.

Yes, with a few improvements inspired by John Browning’s Hi-Power. The extractor is an external design, the barrel is linkless, and the trigger is pivoting; all features are similar to the Browning Hi-Power.

For current lead times, please contact customer service at 763.786.1720 or use our contact form.

There are 19 parts that are direct replacements:

  • Hammer & Pin
  • Hammer Strut & Pin
  • Sear, & Pin
  • Sear Spring
  • Recoil Spring
  • Disconnector & Pin
  • Thumb Safety
  • Plunger Tube, Pins (Front & Rear), and Spring
  • Barrel Bushing
  • Recoil Plug
  • Grip Screws
  • Grip Bushings

There are 3 parts that require some modification:

  • Firing Pin Stop
  • Grip Safety
  • Recoil Spring Tube