Nigel,
There are so many ways to do this in a .308... I have tried a lot of different things, for youth training loads, light practice loads, mild loads to replicate military loads for the FR-7 and FR-8 ( short HK G3 barrels on a Mauser action), .300 Whisper loads...
Not knowing what you are tracking, and whether you need a heavy bullet or a lighter one, here are a few things I know from experience:
A well-placed shot from a 165 to 200 gr bullet that arrives at 1,700 fps and does not open at all, will completely penetrate a large animal, and leave a wound channel 3 or 4 times its diameter for a lot of it.
As several have said, no need for a premium bullet. Most are tough bullets. Only the Nosler Partition has as soft nose.
The Barnes TSX and TTSX will upset and expand at an impact above 1,800 fps if they hit any muscle or bone before entering the body cavity.
Likewise, most bullets 165-gr and heavier are made tough for larger game and either closer range from a .300 Savage or .30-40 Krag, or full-power .308 at 200 yards, or .30-06 / .300 H&H at 300 yards.
You can use a 150 or 170-gr flat nose .30-30 bullet, and load the .308 like a .30-30... a known entity. It works. A flat nose 158-gr out of a .357 carbine will flatten deer or cow elk with a proper shot ( done it, seen it done).
You can use a 125-gr Sierra ( or similar ) at 2,600 fps, with recoil like a .243. It has a 200 yard trajectory like a normal factory 165-gr load. It kills deer.
Before loading any of these up, why don't you buy some reduced loads, like the Federal ( heavier, slower bullet) or the Hornady and Remington ( 125-gr at 2,650 fps )?
------------------------------------
.308 reduced load:
125 grain Sierra, 42.3 grains of IMR 4895, CCI 200 primer
125 grain Sierra, 45.35 grains of H-4895, CCI 200 primer
125 grain any, 35.0 grains of H-4198, CCI 200
It should kick out about 2700 FPS from a 24-inch barrel, very accurate.
----- 125-gr M1A load for 200 yard matches -------
125 gr Speer TNT 2.75" OAL LC case, WLR or Rem primer
(M1A Supermatch, 1:12) Federal 210M primers
125 gr Nosler BT or Sierra 125 Prohunter work great, too
42.5 gr IMR-4895, 2,650 fps for all these
41.5 gr H-4895,
42.5 gr IMR-4064,
45.0 gr Varget.
I haven't found a combination that shot worse than 3/4 inch.
38.0 gr H-4985 = 2,600 fps in 24-inch Steyr. 2,450 fps in FR-8
Nosler BT or Sierra PH
Federal 210M primer
2.80 inches OAL
0.525" groups
----- 130-gr ---------------------
Speer 130-gr
2.75" OAL
38.0 gr H-4198, Fed 210M
2,650 fps
43.0 H-4895 2,675 fps from Steyr 24-inch
----- 150-gr mild -----------------
2,500 fps loads, various bullets and barrel lengths
150-gr SPT flat base or SST at 2,500 fps SST works well.
150-gr Hornady RN at 2,400 fps in Savage 99
150-gr Winchester FP .30-30 bullet at 2,350 fps from FR-8
40.5 gr H-4895 = 2,500 fps in 24-inch bolt action
41.5 gr IMR-4895 = 2,400 fps in 20-inch Mannlicher or Savage 99
41.0 gr IMR-4064 = 2,350 fps in 18.5 inch FR-8
40.5 gr Varget = 2,400 fps in 20-inch carbine
37.5 gr H-4895 = 2,390 fps in 24-inch Mannlicher ( .30-30 FN ).
---- 165-180 gr ------------------------------
Most 165 and heavier bullets are too tough for anything below a full power .30-40 Krag or .300 Savage load, as they are made to work in the .30-06 and .300 H&H and proper longer ranges.
Good FR-8 or Savage 99C load for woods, imitates .30-30 saddle gun.
40.0 gr H-4895 = 2,350 fps in 22-inch barrel ( .30-30 FN 170-gr)