It was extremely hard to turn up any bulls over 300" this year. Most of the bulls I saw this year were 5 points or small 6 points. Even during prime rut, these smaller bulls were with the cows. I have a few spots I hang trail cams and have large bulls consistently on camera over the past 5 years...
I don't cow call or bugle if I'm sitting water. If I'm moving on the ground, I like a high pitch soft bugle just to get a response. If I can get a response, I go silent and try to slip in range.
Even if there is a slight chance of running into one, I would prepare as if there are grizz everywhere. I think the 10mm is the perfect choice. Make sure you have good ammo. I like the 200 grain hardcast ammo from Underwood.
The Montana cow elk decoys fold up nicely and weigh next to nothing. I always have it my pack. If it can keep the bull distracted for an extra few seconds, its worth packing.
I use the RIP TKO 300 spine v1 arrows. They penetrate so well and are tough arrows. I use the micro hades pro 3 blade 100 grain broadheads because they hit identical to my field points. I carry one arrow in my quiver that has a sevr 1.5 mechanical. I keep this arrow if I need to take a long...
I have 4 trail cams up right now. I hung each of them early in June. I will head out in two weeks to check the cams and make a plan on where I want to hunt.
I'd take a frontal shot at 30 yards or under. Born and Rasied Outdoors and Elk 101 both have videos about how to execute the frontal shot. Can be lethal but can be a huge mistake as well.