9mm vs 10mm for Bear defense.

Dave0317

WKR
Joined
Mar 22, 2017
Messages
452
Location
North MS
This debate has a lot of parallels with the current trend of smaller rifle calibers for big game.

Less recoil generally results in more accurate shooting.

Plenty of small handgun calibers have the penetration capability to hit CNS on any bear.

More shots and less recoil, means more likelihood of hitting CNS sooner.

The reliability debate is honestly just comical to hear in 2025. If a revolver were more reliable, you would see them being used at police departments, military units, and other people that dont just carry for a chance encounter, but specifically and intentionally put themselves in danger on a regular basis.


As far as the non-CNS shots and warning shot type situations, I think a lot goes unreported, so there is not accurate stats on that. If a bear is curious and gets too close for comfort, a warning shot might actually work, and if there is no blood drawn, is there a requirement to report that to the local wildlife people? Likely not in many places.

The emphasis on CNS hits is because that’s the only thing that is an immediate stop. We all know a deer can run up to 75 yards even with a disintegrated heart and lungs. The military and police world refers to this as timers and switches. CNS is an off switch. A determined bear shot in a lung, may still close distance and maul a person before its brain finally times out due to blood/oxygen loss.
 

z987k

WKR
Joined
Sep 9, 2020
Messages
1,921
Location
AK
This debate has a lot of parallels with the current trend of smaller rifle calibers for big game.

Less recoil generally results in more accurate shooting.

Plenty of small handgun calibers have the penetration capability to hit CNS on any bear.

More shots and less recoil, means more likelihood of hitting CNS sooner.

The reliability debate is honestly just comical to hear in 2025. If a revolver were more reliable, you would see them being used at police departments, military units, and other people that dont just carry for a chance encounter, but specifically and intentionally put themselves in danger on a regular basis.


As far as the non-CNS shots and warning shot type situations, I think a lot goes unreported, so there is not accurate stats on that. If a bear is curious and gets too close for comfort, a warning shot might actually work, and if there is no blood drawn, is there a requirement to report that to the local wildlife people? Likely not in many places.

The emphasis on CNS hits is because that’s the only thing that is an immediate stop. We all know a deer can run up to 75 yards even with a disintegrated heart and lungs. The military and police world refers to this as timers and switches. CNS is an off switch. A determined bear shot in a lung, may still close distance and maul a person before its brain finally times out due to blood/oxygen loss.
And just like the small caliber debate, the bullet matters a lot more than the headstamp. I'd rather have a 9mm with leighigh extreme penetrators than a 10mm with hollow points.
 
Joined
Jul 20, 2019
Messages
2,690
I hunt in grizzly country all the time and have been carrying my Glock 29 for the last 10 years. The best argument I have heard for a wheel gun is that if things get close and personal and you have to shove the gun into the bear because it is on top of you, the semi auto will likely fail because the slide might not close all the way. A wheel gun you can keep pulling the trigger and it will go bang. Caliber/cartridge aside, I think one of those 8 round 357s look like a decent option that I am going to explore.
 

rclouse79

WKR
Joined
Dec 10, 2019
Messages
1,951
I currently have a Glock 10mm, but am thinking about trading it or selling it and getting a 9mm or .57. I am leaning more towards the 9 due to cheaper ammo. If I actually practiced with it, it might actually be useful in a pinch.
 
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