I also would go with the 270.
I have shot that shell now for over 40 years. I am a gunsmith, and a have been a guide for 35 years.
As a gunsmith I have made more rifles than I can count, and I have hunted many animals and everything I have ever shot with my 270 with good 150 grain bullets has died fast, and I have only once had to fire more than one round to kill, (and that one time was just a poor 1st shot)
I have shot through every elk I have ever killed with a 270 and left an exit hole. Elk go from about 350 pounds to 800 pounds.
I killed a 385 pound black bear with a 160 grain Nosler bullet about 20 years ago, and I hit both front shoulder bones. Went right through and kept going.
I like the 270 because it WORKS, and because it's very flat shooting.
Just my 2 cents worth.