This is SWIMs first time using heroin and has chosen this snorting route. Please do not bring up the dangers SWIM obviously knows what they are, he just wants to reduce them as much as possible. How big a line should swim start out with? SWIM snorts 30mg of oxycodone about once a week, and that is about where is tolerance is at right now. Like I said, SWIM isn't looking for a warning about addiction he just wants to make sure he does it as safely as possible without ODing.