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308 enough for brown/polar bear?

Yup,. I LOVE, my Beretta, semi Auto, Shotguns !!
I Have, 2 Beretta A-303's,. a 20 ga and a 12 Gauge !
Won, a Couple of, Live Pigeon and Sporting Clays, shoots with, the 12 Ga,.. "Back in the Day", when,.. Much Younger ( Mid 1980's ! )
They're Great for, Ducks and Chuckars, Too !
For Doubles Trap,. I shot, Krieghoff's and Perazzi O/U's and was averaging around, 95-96 Out of 100 at, "the Top of My Game"
I WAS, much sharper, precise / deadly and, Faster,. in my 20's ad 30's ( Obviously ) LOL !
At my wife's last count I think I have 10 Berettas from 390 to present. I don't know why she keeps bringing up the number of guns I have. I have a Citori cx with adjustable comb and Isis recoil system that has been rebuilt twice now. I simply can't find another O/U I shoot better than that one at clays or I would buy it. And I've shot all of them. It just fits.
 
1st: I think the 7.62x51 NATO or the slightly different civilian 308, is one of the worst choices for anything. But its better than nothing.
2nd: The Eskimos tend to use very small calibers for seals, caribou, muskox, bears, wolves etc. of any kind. They prefer .22 cal. (222, 22-250, 223 etc) My Guide told me that the 270 Winchester was his personal favorite for polar bear.
3rd: It is not an endorsement that troops used what they were issued. There choice was made by someone else. Nobody shoots a polar bear and thinks they are over-gunned.
4th: I used 375H&H for both and did not feel over powered. I would only use a 308 if I had nothing better.
 
I ask because I contemplated a semi-auto shot gun with slugs but I read and seen a lot of YT videos about how most shotgun shells are not waterproof. Very few manufacturers make waterproof shotgun shells. If I could find more waterproof shotgun slugs I would seriously consider the Beretta AS300 Ultima Patrol. But, I still think the AK M77, Scar 17 or HK G3/PTR could have the advantage with the 20+ rounds of 308.
have duck hunted in marshes with the nastiest of conditions and shells boxes soaked, shells rolling around in the bottom of a water logged canoe. Never had a problem. No duds, no misfires.

I wouldn't be concerned about "waterproofing"
 
I ask because I contemplated a semi-auto shot gun with slugs but I read and seen a lot of YT videos about how most shotgun shells are not waterproof. Very few manufacturers make waterproof shotgun shells. If I could find more waterproof shotgun slugs I would seriously consider the Beretta AS300 Ultima Patrol. But, I still think the AK M77, Scar 17 or HK G3/PTR could have the advantage with the 20+ rounds of 308.
Remington, Federal, and Winchester shells hold up quite well to moisture. Remingtons buckshot has a waxy substance on the crimps. I'm sure you could treat the business end of slug ammo with a little silicone or wax. You can buy a primer sealant (it's Red) and seal the primers on center fire and shotgun ammo by applying a small amount to the primer of a loaded round. A bottle lasts a long time.
I've had shells get left in the boat after several trips to the salt marsh. They would be seriously corroded. I'd test them in one of my old guns just to see if they would fire. With the 3 brands I named. They generally fire without a hitch.
 
I don't know about that. It works quite well in a general purchase light machine gun (M60). In that role, I can't think of a different round I would rather have.

Tony
In that role it absolutely shines. For many roles it'll work just fine but may not be the absolute best choice. But what is these days. For most roles I'd consider it far away from the worst choice. I have 2 308s. An AR 10 and a bolt gun. I like them!!!
 
I'd take the 308 loaded properly over any shotgun. I've been woefully unimpressed with shotguns on bears. 450 bushmaster loaded with 275gr Barnes wouldn't be a bad choice either.

A good short lever in 45/70 is a pretty handy bear defense too. The lever will be lighter and easier to carry than an AR style rifle.
Just curious. Are you talking 12 gauge slugs, buckshot, or both not working well? I would think the 50 Beowulf in a AR platform should work well too. 338 Federal is all but dead but you can still neck up brass and load for it. I'm just not sure how reliable an AR would be in extreme cold.
 
I'm in total agreement…..just couldn't restrain from mentioning the human angle! Generally, humans move much slower than animals…..unless you're attacked by a Sloth! 😜 memtb
Great…..now I realize I have an unfilled gap in my self-defense repertoire, time to locate and select a "Sloth gun"…whispered rumors of a population turning up near Worland, WY…has anyone seen the SIZE OF THE CLAWS on those things?

"Officer, I swear, when it charged me it seemed like time slowed down and like it was taking FOREVER to close the gap between us!"
 
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Do not worry about other people's thoughts; ask yourself if it is enough to save your life.

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a recoiless rifle was the first thing to come to mind!
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The AR15 chambered in 458 socom with 11 rounds in semi-auto seems like a good option especially when it's not freezing. Now, when it comes to freezing temps and ice forming I don't trust the AR platform.

The owner of Buffalobore has used his 458 socom ammo on 2,000lb+ pound bison, AK/Yukon moose and brown bear and never recovered a bullet, complete pass through.

I do like the Ruger Guide Gun with 20" inch barrel chambered in 375 Ruger. My question is about that barrel length, should I look for a rifle with a longer barrel length for the added velocity or is a 20" inch barrel plenty?
 
20 is plenty, 375 ruger is a higher pressure round than the old hh. Last outing we were playing with my garmin chronograph, friend had his 24 inch 375 hh and I had my 20 inch 375 ruger. On both 260s and 300s mine was still faster by about 50-80 fps. Considering the 375 hh has been the gold standard for bears for a century I'd say a 20 inch ruger is just fine.

The guide gun really is a well thought out package, it would likely cost several grand more to equal or best it.
 
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