I'd put bulls #1-4 between 290-310. I think bull #1 is the biggest. I'd be really surprised if any of them break 310, but I could be wrong! Bull #5 is cool but might score even less. It's hard to tell with only the one angle. I also agree that you might not have 5 different bulls there. 2, 3, and 4 all do have some similarities that make it tough to tell.
#1 - 320" imo the best bull of the group score wise
#2 and #4 - same bull. Right at or just over 300"
#3 - 280" - definitely not the same as 2 or 4
#5 - 260"
Guys get really tripped up on numbers, like sub 300 is a bad thing. A 280 bull is a good representative sample of bulls where I hunt. When you see a mid 300's bull you'll not forget it for a long time. That last bull won't score well....but nets are for fish and it has style.
Just taking a guess looking at trail cam pictures from different distances and angles. Looking at the last picture of number 4 cant see that bull not being a ways over 300. Thinking its all the same bull and different parts of the horns look bigger and smaller in some of the pics. Thats what made me think 325ish . I can usually guess within 10 inches or so in person. not the best guessing with trail cam pics, or looking through spotter 2 miles away. With trail cam pics or long range glassing I can ussually just tell if its something I would be happy with.