Agreed, I use 130 grain copper in my .308, and 80 grain Barnes TTSX in my .243, and push them fast, which is the key with copper bullets.
But there is no better bullet than lead for providing a quick ethical death to your quarry in my opinion.
That is a real PITA.
In my experience Delta are the worst of all the airlines for doing that.
When I book now I just look at it that by the time I fly it won't be what I booked originally.
It should be a contract that they enter into when you book, and if they change it they should pay us for...
I use Winchester 40g subs, with my suppressor, brilliant for squirrel but it is also my favoured round for shooting bunnies, you can often shoot 3 or 4 bunnies before they take the hint and run for home.
Since posting this I have shot 2 red deer, as they were close to another private area I pinned them through the shoulders, they obviously dropped on the spot, then a quick follow up shot, Barnes worked well.