HI Cleveland.
Your 6.5 loaded with 140 grainers, or even 130 grainers, will be fine on hogs.
I've killed two, both one shot kills with my plain vanilla .270 Win with 130 grain Nosler Partitions. One was 275 lbs., a big bruiser.
My guide on the first one was a ranch owner in central California. He said that the .270 with 130 Noslers was a great load, but that in his experience, the .270 / 130 Hornady spire points were almost as effective on hogs as the Nosler partitions. He thought highly of the Hornadys and that was 20 years ago. Hornady has improved its products since them.
I"ve read a lot of baloney about hunting hogs. People have a back up handgun in case the rifle fails and a back up bowie knife if the handgun fails and I guess they climb a tree if the knife fails. I asked a couple of experienced guides about these tales. They said it was B.S. They'd only had problems when they were dealing with wounded hogs at close quarters. They will fight back. The idea is to shoot them dead, not walk up on them with your "backup" handgun or knife. I shot them with my humble .270 and they fell dead. Sorry I have no exciting tales about fighting for my life with my back up knife.
I think your 140 grain Hornady interlocks at 2,800 will be fine. Just place your shot. Good luck with your hunt.