first of all, definately don't sniff it... Morphine has an intranasal bio-availability of about 15%, next comes oral consumpsion at 45% approx, the come pluggind (up the ass basssically) with 65% Bio-availability, and will come on faster, and last come IV with a 99% B-A.
so if you get a good buzz of oxy 30mg oral, you should get a good buzz off 30mg morphine oral or 20 mg,s plugged (sniffing morphin is a huge waste)... wait at least 2 hour before redosing (if you're not "where you want to be"), but only go up by 5mg's at a time...
so crush up the pill, divide powder approqimately into ten similar sizes, and wrap each 10mg in a bit of toilet paper then swallow 3 if you're going for 30mg oral
theres loads of stuff about plugging, but basssacally you get a needless syring, to measure out amounts and stuff like that, mix 2 10mg pilles 20mg's, put into water (on a spoon), mix morphine with water, (not too much water you want it to fit into the needless syring, mie down , pop it up your arse about 2 inches, press the pllunger, wait for 10 seconds then remove needless syringe....
if you have any more questions you can PM me (i had a morphine habit for a bit under a year)
p.s. i have stated very low doses here bu if 15mg of oxy can do it for you, then hey, start low