Casey,
All rifles are different... There is now way to tell for sure if your load is going to be ok in your rifle with out shooting it and checking for signs of pressure... There are a lot of people out there that shoot hot loads with pressure signs and don't even know it... Are you sure that the max load that you shoot right now is safe? More than likely it is, the books usually back off from the max loads a little bit, but its hard to be certain.
Look for extractor marks on the case head, a tight bolt, flattened or blow primers, blow by around the neck, etc. Shooting "hot" loads are not good for your barrel life either... A larger portion of the powder is going to get burned in the barrle rather than in the case, thus eroding the throat... This is not only a problem with "hot" loads but also with shooting light bullets in a large case...
The gain you get by going over max is not really worth it any way... So for an extra 150fps you will be shooting an inch and a half flatter at 500 yards... Is pushing the limit really worth it??? Going to a hot load is rarely the answer to any thing... If you want a flatter shooting rifle buy one, I wouldn't try and push the envelope with an '06 and make it dangerous for yourself or people around you.
Good luck
Ivan