Flat pointed .308 rounds are pretty rare, if they made them at all. You can get round nose, i think i remeber seeing them as light as 150, but this was a while ago.
If your looking for faster kills with the .308 try a softer bullet like an sst, or balistic tips. Just stick to 150s or 165s, as they do tend to shed weight.
Personally ive never found the .30-30 particularly impressive at causing bangflops, but its always been pretty reliable. Infact the only .30-30 i kept for any length of time was an old h&r topper, which i loaded 125 balistic tips for.
Equally, Ive never been a .308 fan, so most of my experience, and opinion is bassed on the .30-06. Other folks may have a better idea of whats available, and other suggestions.