The Wyoming Bear Team carries Garrett ammo.
On the Garrett website, there is a story by a guy who was carrying a short bbl. .44 Mag loaded with Garrett hammerheads. There were two or three guys in front with rifles, and they went in the brush to find a wounded grizzly. The guy with the pistol in his hand was the last guy in line. The bear had circled around, and charged the guy with the pistol. He dropped the bear with one shot; it happened so fast that he said had he had his pistol in his holster, he would have never been able to deploy it.
I don't hunt, and if I did hunt grizzlys, I would only use a pistol as a last resort, but it is an effective tool with the Garrett ammo. These bullets have a huge meplat, and are made of very hard lead. They will break both shoulders of an elk. Walt