Bioavailability aside, I would still rather snort MS Contin than ingest it. I've done both many times with my scripts and snorting it not only allows it to hit you faster, but it also gives you more control over the high.
If you want to get just a little higher, snort a little more. Or, if you need a quick fix but you're not sure just how much you'll need, just snort small amounts until you get there.
Ingesting MS Contin is always a gamble in terms of knowing how high you're gonna get if at all. You have to factor in whether you're on an empty stomach, if all of it is getting properly dissolved within a certain time-frame...etc.
For me, the difference in bioavailability doesn't matter so much when considering that with snorting, I'm getting a nice buzz right then and there.
I remember once I had popped 30 mgs just before a big meal. I had been taking 30mg doses for a while and it was just enough to mellow out the discomfort for which it was prescribed.
I have no idea exactly what happened to this day, but I think the food from the meal caused my stomach to flood with stomach acid, which broke the pills down almost instantly I guess.
I was extremely fucked up all of the sudden out of nowhere. I still remember sitting there at the restaurant with my friend and saying, "Holy shit, those pills just kicked in big time." I had never in my life up until that point experiened anything like that from opiates.
Again, I know I am a lightweight amongst bluelighters, so that's also something to keep in mind. But, what I am trying to say that oral ingestion, in spite of its greater bioavailability, is just too unpredictable compared to snorting.