Problem with factory 6arc ammo, it is anemic in a bolt action. .243 win would be top choice for your situation.
I got an unexpected chance to take my daughter hunting and went with my 6ARC bolt gun. All my hand loaded ammo had BTHP bullets I was using for target practice.
Solution: buy a box of Hornady Match ammo with the 108g Eldm.
Result: Dead whitetail
Had I known about the hunt ahead of time, I would have hand loaded a much faster load using the ELDx.
It is definitely not a good long range hunting bullet, but it is stupid accurate and plenty powerful for the job.