Curl-

It's about time you got a nice little 6.5mm rifle.
On the condition of your new piece -- you think this means you're screwed?
C'mon man, based on the condition of most of your other guns and rifles, it appears you've been banging yourself for quite some time now.
It's amazing you've parted off enough time over the years for your spouse to have sired your children!!

On bore dimensions and the hornady 160
My WJ Jeffery has a rough, oversize bore, and it runs the 160grRNSN quite nicely.
It doesn't like the slightly bigger diameter bullet, which would appear (on paper) to otherwise be the right choice.

Cheers
Tinker