Some of you haven't read the OP
I was wondering how many miligrams of adderall 10mg xr (crushed to a fine powder, snorted) it would take to get a good high?
I have used amphetamines for 2 and a half years so i have a pretty good tolerance, i did 30 mg the other night and didnt feel much at all.
Adderall XR, assuming you defeat the time release mechanism successfully (which isn't hard - the time release mechanism is shit) should be equivilent to normal adderall, on a milligram basis.
What is your normal dose of amphetamine? What do you normally take?
If you normally take instant release adderall, take the same amount of XR, or maybe a bit more to account for imperfect defeat of time release.
Also - snorting adderall, especially the XR, is not really the best way to take it. You get a lot of crap up your nose along with the good stuff, and that can slow absorption significantly - you end up with a nose full of snot-pill-binder-amphetamine (plus wax if it's the XR) mixture that doesn't get absorbed very well.
Note that for reasons which defy logic, a sizable portion of users find that adderall XR, even with the time release defeated, feels dirtier than adderall IR. I've taken both, and the difference is very pronounced, and all the friends of mine who have taken both agree on that. I cannot explain it.