so if the gravity is less than 1.008 i can still bottle w/out the risk of bottle bombs?
Not necessarily, it all depends on how the fermentation has been going, the remaining sugar content, what bugs you've got in there, etc. The worry is that if there are bugs still slowly working on whatever sugars are left, that while fermentation might look done (no change in gravity over a week or so), there is still a slow fermentation that given enough time will increase the co2 enough to explode.
The actual value of 1.008 doesn't really mean much, because it could be a result of a lot of different variables. For instance, if you've got a lot of non-fermentable sugars (even for brett), you could completely finish up around 1.015 and not have to worry. On the other hand, if you've got a bunch of fermentables left, sour bugs could take a 1.008 beer down past 1.000, which could be troublesome.
Rather than worry about the gravity, how long has it been fermenting, and what were the measurements? If its been consistent for a while now (month or more), there's probably not much to worry about. While there may still be some slow fermentation going, its possible that it won't push it past bottle-bomb points. If you use strong bottles (like it sounds like you are), you should be fine. You could even consider carbing a little on the low end of the spectrum if you're really worried about it.
