Wayne
At the risk of offending someone I just have to put my 2 cents worth in......
A lot of the relies appear to be from people with minimal hog hunting experience so keep that in mind. I hunt hogs over 150 days out of the year, shoot over 100 annually and am in on the kill of a lot more by friends and client hunters.
The following works in the real world of TX and I have no way of knowing what type of hunting or conditions you will face in TN.
Rifle: Any accurate 7mm08 or larger with good quality tough bullets will reliably kill hogs. Of guns you listed I'd recommend your .300 SUAM.
Ammo: Go with premium bullets like Barnes TSX, Swift A-frames or Nosler Partitions.
Scope: If you end up hunting like we do in NE TX it is mostly low light or night hunting and a scope that gathers a lot of light and has some form of illuminated reticle is required. Scopes that have worked well for me are Trijicon Accupoint, Bushnell 4200 Elite illuminated, Bushnell 4200 with firefly reticle and Simmons AETEC Master Series illuminated.
Shot placement: There is really only 3 places to shoot a hog if you plan on an easy recovery. Easiest and most failsafe is broadside center of the shoulder but they will usually run 25-75yds and often leave little on no blood trail so recovery in really thick stuff can be difficult. The hog has no vitals behind the shouolder like a deer and a really good diagram of vital areas is on texasboars.com. The two shots that will drop them in their tracks is a brain shot right between the eye and the ear hole (a difficult and chancy shot) or center of the neck which severs the spine, this is my prefered shot since we hunt in really thick stuff that has snakes in it!!!
Wind: Hunting hogs is all about the wind. If they smell you they are gone...... You have to always work the wind to your favor if you want to succeed.
Additional Info: Go to
www.texasboars.com or my ranch web site
www.circlewcranch.com for a lot of good information. All the guys at TX Boars would be glad to help you out.