I have no doubt your 140gr 6.5 bullet will work.
100gr 243 Winchester
130,140,150gr 270 Winchester
140gr NPT, 154gr Hornady 7mm-08
Remington factory 7mm Rem Mag (do not remember the weight)
Have all worked just fine, so I see no reason why a properly placed 140gr 6.5 bullet would not do the job.
150gr Nosler Ballistic Silvertip 300 WSM
165gr C&C 30-06
180gr NPT 300 Win mag
210gr NPT, TSX 338-06
225gr Trophy Bonded 338 Win Mag
250gr C&C 35 Whelen
270gr Hornady 375H&H
Have also worked.
My personal favorite is a 338-06 with 210gr bullets.
I can certainly understand the bigger diameter projectiles for dark timber close range hunting.
If I found myself in that situation, I would probably carry my 9.3x64 loaded with 286gr Hornady or NPT. The 300gr SAF could also get some consideration.
My 9.3 rifle would get the nod simply because it would carry better than my 375 in the thick stuff.
