Sierra manual goes a bit higher. Test gun identified as Krag, 22" barrel.

30-40 Krag

.308 220 gr. RN
Cartridge OAL: 3.000"

Velocity------1800     1900     2000     2100            
IMR-4350      38.2      40.2      42.3      44.4      

Accuracy Load: IMR-4350/42.3 grs.; 2000 fps/1954 ft.lbs.
Hunting Load: IMR-4350/44.4 grs.; 2100 fps/2154 ft.lbs.

Conservative loads certainly offer their advantages, especially for target shooting, but if Sierra's data can be trusted there may be little cause for alarm at 42.5 grains