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You are at:Home»Guns & Gear»My 10mm vs. Mountain Lion
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My 10mm vs. Mountain Lion

Buddy DoyleBy Buddy DoyleFebruary 15, 2026No Comments6 Mins Read
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My 10mm vs. Mountain Lion
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By Bridget Fabel

Posted in
#Survival

As a full-time fly fishing guide, I’m often on the mountain scouting multiple fishing spots every morning and evening. It was a beautiful, warm evening in June when I decided to make the long trek to one of my favorite spots. This spot is a hike-in lake, about a mile and a half each way or so, to the most beautiful alpine lake filled with hungry Colorado Cutthroat. I set off around four o’clock in the afternoon, which would get me to the lake for the prime-time evening bite.

Bridget’s 10mm Springfield Armory Range Officer Elite Operator proved to be the best gun for mountain lion defense.

Now I know this sounds crazy, but on this particular day, I was hiking with my cat, Brookie, named after my favorite type of trout to catch. She was about two months old, and she had been on fishing hikes with me since she was three weeks old. I travel a lot, and fish alone a lot, so the plan was to find a good fishing buddy who wouldn’t tell others about my favorite places and could also stay home while I traveled. Brookie has always liked sitting on my shoulders while I hike, and she did so that day.

While the kitten may have drawn the mountain lion in, it was the author's decisive movement and carrying a 10mm pistol that prevented the attack.
Brookie, Bridget’s cat, shown here riding on her shoulders, was with her on this particular day.

Warning Signs of a Mountain Lion

About a quarter of the way into the hike, Brookie started meowing like crazy. I figured it was because she was young and still new to this hiking thing that I was making her do. She was meowing so much, and sounding so much like a young kitten, that I thought to myself “you are going to call in a predator.”

A domesticated animal can act as an alarm or early warning system when a predator is nearby. While a 9mm can stop a mountain lion, a 10mm is the best handgun for mountain lion defense.
Brookie was meowing and moving wildly that day, making Bridget stop to adjust her gear. It’s that moment that likely prevented the mountain lion attack.

After another quarter mile or so, her meowing had increased, and she was moving around on my shoulders. When she is in the mountains with me and sitting on my shoulders, I keep her harnessed to a leash that I hold in my hand. With her freaking out and moving around, I felt the leash pull tight around my neck as she had wrapped it around me. I stopped for a second and turned my head over my shoulder to unwrap the leash from my neck and backpack.

The author demonstrates why the Springfield 10mm 1911 is the best gun for stopping mountain lion attacks.
Bridget does not venture out into the wild without a sidearm — which was a very good thing that day. The 10mm Auto proved to be a good choice when confronted by a mountain lion on a hiking trail.

As I turned, I saw a big, strawberry blonde-colored mountain lion about 10 yards behind me. My stopping to fix Brookie’s leash had surprised the mountain lion, and it shot off to my right and into the woods. I’ll never forget seeing it crouch down like a housecat in full pounce mode as it weaved through a thick forest of aspens. Its long tail was really recognizable as it ran away through the aspens until it was eventually out of my sight.

The author open carries her Springfield Armory 1911 10mm when in the woods and on the trail specifically for mountain lion defense.
The Springfield Armory 1911 pistol chambered for the 10mm Auto cartridge is part of the author’s gear kit when she heads out.

10mm 1911: My Other Partner

This was a very eye-opening moment in my life, for I had just been stalked by a giant mountain lion in the middle of the woods while alone. As fate would have it, that was actually my first day open carrying my new Springfield Range Officer Elite Operator 10mm in the backcountry. Previous to this day I had always open-carried the Springfield XD-S in 9mm. After seeing a giant male bear on a trail camera in a place I fish often, I knew a 9mm wouldn’t cut it. I decided that I wanted a round with more of a punch, and a magazine with increased capacity in case I needed to unload on a threat.

Mountain lions are dangerous predators. Good practices when on the trail will often keep them away. However, for a determined mountain lion attack, the 10mm Auto is the best handgun cartridge for self-defense.
When Bridget stopped, she turned around to see a mountain lion stalking her. Image: Shutterstock/Warren Metcalf

From reflexes or instincts, that day that the mountain lion stalked me, I had my pistol immediately drawn and in position. As soon as it started to run away, it was clear I wasn’t going to need to use it, but it gave me confidence to know it was there and that I was ready.

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I know many people fear venturing deep into the backcountry alone. There literally could be lions, cougars and bears at every corner — and you never know when you’re going to bump into an aggressive one. Having a reliable pistol on my hip gives me the confidence to go on the fishing and hunting adventures that truly are my favorite experiences in the world.

Author trains with her Springfield 1911 in 10mm to stop a mountain lion attack.
The author open-carries the 10mm in her left-handed holster rig, and drew it the day she was facing the mountain lion.

Lessons Learned

Looking back on that June day, I remember the mountain lion’s features so vividly. When I turned around and first saw him, he was close and low to the ground in his “stalking” or “sneaking” position. I’ll never forget the look in his eyes, which seemed more out of curiosity than aggression. I’m sure this big tom heard my little kitten crying and had to come investigate. I’m also sure that my little kitten Brookie sounded like a tasty snack!

On the hike back from fishing, I paid attention to my tracks and those of the mountain lion’s. He was stalking me for at least half a mile. He was so quiet and stealthy that whole time that I probably would have never seen him if I hadn’t turned around.

From this June day, I learned that it is always important to glance behind you while hiking. A quick 360-degree glance can give you more time to react to a predator stalking you. I also learned not to take my cat into really wild places. She still goes fishing with me a lot, but I make an effort to keep her out of places where I know there are lots of bears and mountain lions. I know that because of her smell and meows she could act as an attractor to animals that I’m not looking to be stalked by.

The author with her mountain lion gun walks along a hiking trail.
Bridget learned to stop and check her surroundings regularly — and never to leave her pistol behind.

Stay safe out there, and remember that carrying a reliable firearm like the Range Officer Elite Operator is the greatest confidence boost that you could ever bring to the backcountry. Thanks for reading!

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