I'm sure I'll offend somebody, I usually do when I say what's on my mind, but that guy that got mauled did several things wrong and the worst was the way he reacted when he saw the bear. The bear was on a kill and the guy started waving his arms and yelling, that's what you do when you see a bear that's just walking around with no particular interest in what's going on around him. When a bear is on a kill at this time of year he's trying to put on fat for the upcoming winter and waving your arms around and yelling just makes him think that you're trying to take his food away. The best thing to do when you see a bear on a kill is to just back away without challenging the bear in any way and hope for the best. Then the two hunters attempted to use bear spray when the bear was actually charging them at close distance, that's about useless at that point in time. Then the guy that was mauled evidently didn't practice with his bear spray because he wasn't able to disengage the safety and he panicked and dropped the can. Finally, when he realized that the spray wasn't going to do squat under this situation, he tried to use his gun but he was so close that the bear just swatted it away and then jumped on him. A bear can run at speeds of 40 mph, at a distance of 50 feet you'll have about 2 seconds to respond before that bear is in contact with you. There is a big difference between a charging bear that's trying to protect it's food or cubs and a casual bear that is just curious. I won't trust spray on a charging bear but I'm sure it will work most of the time on a curious bear.
I live northwest of where you intend to go (southwest of Helena by about 30 miles) but I'm already hearing a few elk here and there, not many but from time to time I'll hear them but only at night - usually around midnight or so. Nothing that's going to help you locate them during the day. I don't know what it's like down in the area you are going but up where I live calling is pretty useless.