What load have you been running with the 167s? The reason I ask is that 0.077" seems like a LOT of throat erosion. I typically see well under 0.010" erosion per 1000 rounds in my .308s, which are all wear Bartlein barrels, so I wouldn't expect to see anywhere close to 0.077" erosion after 3000 rounds. If you're running the factory barrel, that might account for some of the difference; different barrel, different steel. Nonetheless, I'll also ask how certain you are of the accuracy of that measurement? Any discrepancy in the distance to "touching" measurement could put your seating depth way off from what it was, or what the rifle actually wants.
The suggestion of purchasing one of the Teslong borescopes for about $50 is a good one, particularly in this circumstance. Carbon buildup, or some other issue that you can't visualize without a borescope might be affecting the measurement. Just be aware that purchasing a new borescope can sometimes result in what I like to call "Borescope Anxiety Disorder", or BAD. Those that haven't looked at their barrels routinely sometimes become distressed over every little fire-crack, pit, or other anomaly they might see when they start using their new borescope. If you decide to buy one, I would suggest starting with the "big" picture first. Is there a lot of fouling in the throat? Is there a sizable carbon ring, which typically looks pretty much exactly like the name indicates, either between the edge of the case mouth and the end of the chamber, or slightly into the rifling/bore just ahead of where the bullet ogive would be situated? Is there a substantial buildup of copper, especially in the last inch or two of bore near the muzzle? You will certainly see a lot of fire-cracking in a barrel with 3000 rounds; that is normal. Just don't get caught up initially in excessive concern over every tiny nick, scratch, or piece of lint you might see.
The good news is that if you have any serious carbon fouling, that can largely be removed. You can search here to find various methods by which people achieve that goal. Everyone has their favored approach to do this. Severe fire-cracking can also be remedied to some extent. KG-2 bore polish for about 80 strokes in the first few inches of barrel is one approach that can [temporarily] minimize the effect of the fire-cracking and possibly gain you another few hundred rounds before it re-appears. The process is not infinite, it can't simply be repeated every 500 rounds or so to gain an additional several thousand rounds from an old barrel. However, it can often allow a barrel to shoot much better for a finite number of rounds.
As has been suggested, it sounds like your barrel might benefit from some specialized (i.e. above and beyond your normal cleaning regimen) cleaning steps if any of these problems are evident. Frankly, you could probably just already assume those problems exist at that round count and undertake the proper cleaning steps even if you don't purchase a borescope. Then start back with fresh distance to touching measurements, and proceed with load development in an unbiased manner, essentially as though the rifle was new (i.e. don't base the new load development process after cleaning on the previous load parameters).