Well it might seem strange but unless your going to be shooting regularly at over 300 yards then a Boat Tailed bullet is not needed and plain base bullets can be more accurate
. So a 130 grain flat based bullet would work very nicely.
I would also practice with the ammo I would be hunting with, means less re-zeroing and you get a feel for the cartridge/rifle performance
. As I have never even seen an Elk let alone hunted them I am not really in a posotion to advise on hunting them. But from freinds who do live in Elk contry and DO hunt them the .270 is adequete but not the best Elk cartridge their is
but also I could not fault you thoughts on using a heavier tougher bullet on these large animals
Congratulations on your new CZ 550
it happens I like the CZ-Brno rifles
having an older one, it's a Model 601 in .308 Win, now back to ammo. Not sure who loads flat based bullets in their commercial ammo. I am just getting to the last of a box of 130 grain Nosler Solid Base bullets in my .270
wish I could get some more
Good Luck.