Coonan 10mm Automatic, life imitating art


Over the past few years I have reviewed several Coonan pistols, the .357 Magnum , the .357 Magnum compensated , the .45 Automatic , and now the 10mm Automatic. You can check the hot links if you are interested in reading any of the other reviews.

I liked all of those pistols fine but being the 10mm Auto is my favorite handgun cartridge I am throughly grateful to see Coonan adding that cartridge to their growing line of handguns.

First Impressions 

Notice the extended thumb safety and slide stop. The pivoting trigger broke clean at 3 1/2 pounds with just a touch of take up and minimum over travel.

Note the spring loaded external extractor, skeletonized speed hammer.

Beavertail grip safety with incorporated palm swell. You have the option on the steel mainspring housing for checkering.

Rear 2 dot sight is adjustable for windage via set screw and drift adjusting in the dovetail. Coonan offers several options for sight configurations. Slide to receiver fit was snug but not tight enough to cause any issues.

The front sight is dovetailed and nicely blended into the muzzle of the slide.

Average 3 shot group shot from a rest at 25 yards. Please see the chart for complete list of ammunition and groups shot.

After some 300 rounds all the innards checked out with no signs of wear. I know 300 rounds is not an awful lot of rounds downrange but if something was not fit correctly or there was a problem, I expect it would have shown up by now.

3 shot 25 yard groups from a rest

Range Time 


After some 300 rounds downrange without any issues with the pistol, I am digging the new Coonan 10mm. I would see this pistol serving very well as a carry gun for street or trail as well as home defense. The 10mm Auto is a powerful cartridge, exceeding the single stack .45 Auto in energy and capacity and .357 Magnum energies with the benefit of being chambered in an autoloader. The Coonan is a cross between a 1911 and a Browning Hi-Power which brings a few unique features, such as the linkless barrel, to bear that is conducive to running a high pressure round while keeping wear and tear to a minimum. Even with the monolith cut on the dust cover the Coonan fit the leather 1911 holsters I had on hand. Personally I favor the new optional satin finish over the stainless, and am hoping Coonan will decide to offer it as an option on other pistols. All in all I am satisfied with Coonan’s new offering and I look forward to it being released into the wild.



  • Model: MOT-10
  • Material: 17-4 Stainless (Slide and Frame)
  • Finish: Straight-lined or Satin Stainless (Based on SKU)
  • Action: SA
  • Stocks: Black Walnut / Black Aluminum (Based on SKU)
  • Barrel: 5” (Carbon Steel – Chromed)
  • Sights: Novak Compatible Dovetail (FB, FWD, AWD, FN, AN – Based on SKU)
  • Weight: 40oz (empty)
  • Length: 8″
  • Height: 5.5″
  • Weight: .9″
  • Caliber: 10mm Automatic
  • Magazine: 1 or 2 (Based on SKU)
  • Capacity: 8+1
  • Features: Full length dust cover, linkless barrel, pivoting trigger, external extractor, extended slide stop and thumb safety.
  • MSRP: Starting at $1399



Double Tap Ammunition 


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11 Responses to Coonan 10mm Automatic, life imitating art

  1. 33Charlemagne August 10, 2017 at 11:33 pm #

    Where do you get this “The 10mm Auto is a powerful cartridge, exceeding………….. .357 Magnum energies”? Following the link in this article to Double Tap’s website and looking to make as much of an “apples to apples comparison” as possible. I found that their 10mm loads with 155gr bullets have a muzzle velocity of 1400 fps and develop 675ft/lbs of muzzle energy out of a Glock 20. Their 158gr .357 Magnum loads have a muzzle velocity of 1400 fps and develop 688ft/lbs of muzzle energy out of a 4″ Ruger GP-100. The .357 has a slight edge but for practical purposes they develop the same energy. Which of the two “develops more energy” depends upon the specific loads compared rather than the cartridge. The real issue in choosing between the two cartridges is the type of gun. 10mm works better in semi-autos and .357Magnum works better in revolvers.

    • Hunter Elliott August 11, 2017 at 5:03 pm #

      Yes but ft lbs of energy is not the end all be all number. The 10mm Auto can be loaded up to a 220gr bullet while the heaviest .357 Magnum is 158gr. Also the 10mm Auto is launching a .40″ bullet over the .357 bullet. So you have a larger, and heavier bullet that can be loaded to similar velocities.
      The 10mm Auto is a more powerful cartridge when every aspect is considered.

      • 33Charlemagne August 11, 2017 at 10:03 pm #

        Well you did specify “exceeding………….. .357 Magnum energies”. So I focused on energy levels. Still the.357 Magnum can be loaded with bullets exceeding 158 gr. Underwood and, Buffalo Bore for example each list loads with 180gr bullets and Cor Bon has a load with a 200 gr bullet. And the cartridge can be handloaded with even heavier bullets. See So you can go heavier with bullets for the .357. That does not always translate into higher “energies”as velocity usually goes down with a heavier bullet.The 10mm does have a larger diameter bullet which helps on the Taylor KO Factor.But the difference in bullet diameter is not that great.The exact diameter of a .357 bullet is 9.07mm vs 10.16 for the 10mm. Again I would maintain that the two rounds are basically equal.

      • Bernard De Sousa August 21, 2017 at 6:23 pm #

        Hi you can load a180 gn in the .357 mag do your home work

        • Hunter Elliott August 21, 2017 at 10:19 pm #

          I have done my homework, you can load up to a 220gr in the 10mm Auto.
          Even with the 180gr the .357 Magnum and 10mm Auto have similar velocities, but the 180gr is a non typical bullet weight for the .357. The heavy 10mm Auto loads tread into .41 Magnum energies.

          • 33Charlemagne August 22, 2017 at 2:07 am #

            Let’s take a look at this comparison. Buffalo Bore loads both a 10mm with a 220gr bullet and a .357 Magnum with a 180gr bullet..Their 10mm 220 gr load has a muzzle velocity of 1200 fps and produces 703 Foot Pounds of muzzle energy. Their 180gr .357Magnum load has a muzzle velocity of 1400 fps and produces 783 Foot Pounds of muzzle energy. Buffalo Bore is not known for wimpy ammo so it is safe to say you are not likely to find much hotter factory ammo than this. Remember the .357Magnum has more case capacity than does the 10mm although the 10mm has a higher maximum pressure.he two factors pretty much balance themselves out when it comes to power potential of the two cartridges.. .

  2. Notch August 11, 2017 at 10:18 am #

    i know every time i pop a few rounds through the 1911 .357 magnum i WISH i could be dealing with a cylinder gap!

    having carried numerous .357 mag revolvers on my belt since the late 70s, i would never go back to one, unless i’m dinkin around at the range (or out huntin wabbits). the 1911 is a superior platform for defense when compared to a wheel gun.

  3. Dave August 17, 2017 at 5:43 pm #

    I have owned a Coonan 1911 357 mag. Model B since 1989 and I love the way it shoots. It goes to the range with me 95% of the time. I also shoot 1911’s in 45, 38 super and 9mm and it looks like a 1911 in 10mm is going to be my next buy.

    • 33Charlemagne August 17, 2017 at 11:41 pm #

      One of the guns on my current wish list is the new Ruger SR1911 in 10mm. Unfortunately it’s the old story of so many guns so little money!

  4. Matt Wilson August 23, 2017 at 1:17 am #

    If you really want to compare the .357 to the 10mm you have to do so as equally as possible. Now, how can you compare the 10mm Coonan to a .357? Wait, how about compare it to the Coonan Classic in… wait for it… .357. The other thing to note is that every single official statistic on the .357 cartridge is in what type of firearm? That’s right, a revolver. Can anyone figure out what the lack of a cylinder gap in the Coonan will do to the actual performance of the .357? Last I heard, and read, was increase it. Into… wait for it… .41 mag energies. And 180gr is no longer an atypical .357 load. I run 180gr Remingtons, Armsacor and a few others through my Classic.

    Everyone needs to redo their homework on this one.

  5. Bernard De Sousa August 23, 2017 at 9:04 pm #

    HI thanks for your feed back ,I am a ex South African and have hunted with the .357 mag for the last 25 year,s and have seen animals drop real hard with a .357 mag ,have also been reloading for a good 42 years and it has always been my to go Rifle for most of you med size game ,I have seen the .357 mag go through a lot of things with that 180 gr bullet ,I am a Rifle builder here in the USA now ,I will be getting a Coonan .357 mag very soon did see them at the Shot Show this year and at the NRA here in Atlanta ,have sighed up to be a dealer for this year ,but the $$$$ is going very slow.
    Thanks Bernard

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