Two pairs of archery hunters were attacked by a grizzly bear or bears in Montana, in the Gravelly Mountains. The attacks occurred within 11 hours and one mile from each other. Because of the proximity, it is suspected the same bear was involved in both attacks.
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The bear struck one of the men as the other was reaching for his bear spray. The man fell to his hands and knees, then the bear grabbed onto his backpack.
The other man deployed bear spray at the bear. When the spray reached the bear's face, the bear let go of the first hunter and attacked the other hunter. The man continued spraying the bear's face, and the bear eventually let go and left.
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The second attack occurred eleven hours later, about a mile away. ... We know [the victims'] names, Chris Gregersen and Donivan Campbell. The attack was very similar to the previous attack. Donivan Campbell was grabbed before he could deploy a defensive weapon.
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Chris Gregersen wrote they used 9 mm pistols to defend themselves. He was of the opinion bear spray would not have worked in their situation. Officials conducted a search, but did not find the bear.
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Eight days later, on the 24th of September, 2019, another hunter was attacked in the same area. He survived, but details are sparse at this time.
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The media reports are emphasizing the effectiveness of bear spray, and mostly ignoring the effectiveness of 9 mm pistols. You have to search to determine pistols were used and effective.
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357 Magnum mare's leg?
454 Casull Ruger Super Redhawk?
For a trail gun, you're not hunting bears. You just want to survive if one decides to hunt you.