Spoken from experience
Accuracy is extremely important, every miss makes them more wary. IMHO the best rifle would be an AR15, but we live in the land of idiot laws and fudds who say "why would anyone need that?", but I digress. A semi auto is a benefit as beavers that have not been hunted may not dive after the first shot. I got a young one this year that refused to dive after the first two misses, the third found it's mark.
Optics are a good idea as well, even a large beaver only presents a small moving target. While I don't have a picture one of my nieghbors shot a large one west of my place and he weighed in at a staggering 92 lbs
Beavers are a solid animal with a thick skull. 22lr head shot will not usually kill a large beaver outright and follow up shots are necessary after they inevitably resurface.
I plan on purchasing a mini14 target model with my beaver bounty money. 223 is a good varmint round and the mini14 target is said to be AR15 kind of accurate. As I said every miss will decrease your chances for sighting them. It is very important to make every shot count is you plan on hunting at the same time of evening. Beavers will change thier habits and activity times to protect themselves from being shot. Generally they become very active just before dark. I find a few hours before sunset is a good time to get them at the dam, then just before dark I head to the lodge and paste them as they "leave for work".![]()
According to local expertise, though I have no experience with this, is beavers will become much less wary of humans in a boat thant if you are onshore.
YMMV
you should take a look at the remington 7615, you can get LAR pistol mags, or use cheap common AR15 rifle mags. I got one, and find it a very handy rifle.


















































