Article I saw on another site. Man stops bear attack with Glock 10mm -

https://gunwatch.blogspot.com/2018/09/man-stops-new-mexico-bear-attack-with.html

Excerpts -

The mesa is not very large. The temperature, even at 6500 feet, was in the upper 80's. The bear and dogs heated up and slowed down quickly. They were fighting on a little bench, right under the rimrock. It was strewn with refrigerator sized boulders, with some cedar trees, good sized for the area, but too small for a bear to climb.

Complacency is the enemy of everyone who works in dangerous situations. People do things hundreds of times. They start taking shortcuts. Bridger normally carries a Glock 20 in a Galco holster, when he is hunting bears with clients.

- - - -

As an after thought, he takes the Glock 20 10mm semi-automatic pistol from his vehicle and shoves it in his waist band behind his cowboy belt. It is loaded with 175 grain Hornady Critical Duty FlexLock loads. The magazine only has 10-12 rounds in it. A few months earlier, he had heard the theory of "spring set". He decided not to keep the magazine fully loaded.

- - - -

This bear never read the rulebook. It does not run. The bear sees Bridger, turns toward him, and flattens its ears back along its head. Its eyes have locked on Bridger. Bridger has watched hundreds of bears in similar situations. He knows he has been targeted. He drops the phone and snatches the Glock from his belt.
- - - -

Bridger does not remember shooting during the fall. His family found shell casings down the trail of broken tree limbs and brush. He knew the Glock was his lifeline. His right hand is skinned and bruised. He holds on with a death defying grip.

Bear and man stop downslope, wedged into brush and boulders. Bridger can feel the bear. He frantically attempts to disentangle. The bear rears erect, jaws ready to strike. Bridger shoots him again, in the front of his chest. Bridger slides/falls further down the slope. The bear pursues him. He screams at Janelle to stay away.

- - - -

He fires. The bear releases his lower thigh, then grabs his calf, just below the knee. The shot missed the spine. Man and bear are moving fast, but in Bridger's hyper aware state, time is slowed. He sees an opportunity for a headshot. He presses the trigger on the Glock.

Click.

End excerpts

As a Glock 9mm carrier I was particularly interested in this -

The magazine only has 10-12 rounds in it. A few months earlier, he had heard the theory of "spring set". He decided not to keep the magazine fully loaded.

I Googled it, but could not find anything except ads for after-market springs for Glocks.