Myself nor others are going to be able to answer this without knowing your ROA.
Oral, Nasal, Plugged, IV?
All have quite differing bio-availabilities which can make a huge difference.
For example my GF could eat 5mg of Opana IR and not feel to awfully much.
If she were to snort the same 5mg she'd be nodding right out.
For another example...
I could handle an OC 80, I normally take OC orally.
I would crush and parachute 40mg doses at a time, a few hours apart as I prefer to have longer experiences.
I could eat 40mg of Opana ER (Guessing that's what you have, as I don't believe the IR's come in 20's)
and be nowhere near overwhelmed.
For me personally I find OC oral and Opana oral to be almost the same potency wise, Opana perhaps a bit stronger.
Now if I were to snort that same 40mg's of Opana I'd be fucked.
40mg snorted imho is considerably more than an 80 OC.
I don't have the time at the moment to get you specific numbers, but figured these anecdotal examples might help.
At least until someone else with more time chimes in with exact numbers.
Considering this; if you'd like to go ahead and mention your ROA's we could answer your question much easier.
