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Honestly, if you are posting on 4chan yo figure out what gun to buy, then you aren't going to be able to hit a bear with whatever gun you do buy.
The first gun you should get is a .22, and practice shooting.
If you get a .300 win mag and expect to be dropping aggressive grizzly bears with no experience you're just going to end up wounding a bear.
Do you know what wounded bears do? They kill everything they can see until they die. Including you.
Bear spray until you know how yo shoot a gun. Even then, bear spray is effective at detering a curious bear. The bears around you are prob not aggressive acting, so a good blast of bear spray will make them associate your place with pain.