Get the rifle that fits you best.
Jimro
Handler,
He's right and so are you. your SD reference to a newer bullet still means nothing to the animal hit. The BC is more important in placement of that bullet.
A 260gr 6.5 in the boiler room of an ELK still means the same thing as that "new" 180gr .270
Seeing as how you're out there in Big Sky Country, I'll respectfully defer to your experience though