I'm jealous that 500ug of bupre is a near-OD for you. Still! I wonder what it is that makes some people have way higher tolerances than others? My oldest friend went through years of intense opiate addiction, it ruined his life a lot worse than mine. He was driving into the city almost every day to pick up bundles of heroin (back when it was still heroin) from the ghetto, he got robbed twice and beaten once. I say he drove to the city almost every day, but he did heroin all day, every day and had horrific withdrawals when he didn't. Anyway, his tolerance was always low and never really went up much. He would do one line and be nodding his balls off, meanwhile I was just doing kratom still back then and would have to do 4 or 5 times what he did to nod, when I was visiting home and I'd go out with him to get some. He would take 10mg of oxy even at the peak of his tolerance and get high, 20mg to nod, 30mg to puke, meanwhile I couldn't feel 10mg of oxy (nor could I ever, really, even as a relative opiate virgin). He got into tramadol for a while to get off heroin, and he would take 100mg max. he said one time he took 150mg and felt like he was going to have a seizure and laid around vomiting all day. But I could take 500mg of tramadol and just get a little buzz, it's never done much for me.
Even after I stopped for 5 years, when I relapsed, I took around 100mg of morphine... classic mistake that gets people in trouble, but for me it was just a decent high, though it made me nauseous after a while. When I got into poppy pods a while back, I was doing about 80-100 grams in a day. Granted, I was nodding and very high, but still. I have a permatolerance, and I've always been hardheaded to opiates. It sucks!