My PH in Cameroon decided the wind and cover were right to sneak up to within 25 yards of herd of elephants. I was holding my .450/400 and just had this feeling of being naked and vulnerable should the situation "change". Anything that did have a lanyard attached wouldn't not have given me confidence.
I'd recommend .338 and up for Brown Bear, but let me admit I've not taken one. Big brown bears are substantial critters. .375 H & H is the minimum for African DG game including lion and buffalo for a reason. I'd consider a big brown bear to be in that same class.
"The Democrat Party looks like Titanic survivors. Partying and celebrating one moment, and huddled in lifeboats freezing the next". Hatari 2017
"Hokey religions and ancient weapons are no match for a good blaster at your side, kid." Han Solo
