Hi guys, 2 days ago while trekking through mountains in SE Poland (Bieszczady) I had a surprise meeting with a large (at least by local standards) boar Brown Bear. I reckon approximately 300kg-660lbs. It was in the middle of national park so I was unarmed as the whole park area is under complete protection though there is fantastic hunting outside of it. I had my wallet on me so all I could do was bribe the brute. Anyways, after some rather distressing displays of grumpiness - standing on its hind legs and roaring loudly the bear turned around and walked away. When standing on it's hind legs the bear absolutely towered over me and I'm 181cm tall. After we got over the shock, my wife and I all of the sudden were no longer tired despite having walked in the mountains for the last 8 hrs and quickly got out of there and got back to the lodge. After putting fresh underpants on I had a beer (appropriately name Ursa) and a think and decided to never ever under any circumstances find myself in such situation again. Now, I do these trips few times a year and unfortunately carrying a rifle is positively not an option, my question is - would a 357 Magnum revolver be a reasonable defence weapon against a bear? What ammunition would you use? I've no idea what the legal implications of me shooting a protected species in national park would be but I'd much rather face them than the claws. I have a 7 shot 2.5" 357 S&W which would be quite easy to carry. If any of you gentlemen have practical experience or reliable knowledge I will much appreciate your help.