You can plug some morphine sulphate pills- it works much better than oral or snorting- the IR ones are good (Sevredol, for instance, work well). The ER/LA pills are trickier, but it can be done- in my country there is no heroin, everyone buys morphine pills and 'turns' them with 'double' -Acetic Anhydride- in their kitchen.
You need to grind the pills (MS-contin) or little beads (M-eslon) up into a fine powder (this is much more difficult than you think), two spoons works best. Put the pill powder in a spoon and add a small amount of baking soda- street wisdom says '1/8th as much baking soda as there is powder', less is is more, but it's all just eyeballed- and mix the two together somewhat evenly then spread the powder into a neat little O ring in the centre of a spoon. Add a little water, a couple of ml is all thats needed to make the mix a runny paste which you should try to spread evenly (but not too thinly) in th spoon. Cook off the water on a stovetop, stopping to cool the spoon regularly so you don't burn the paste. Filter with cotton, or better yet, a wheelfilter. No one shoots morphine here, you get a pill and turn it or you don't bother with the pill.
That is just the first step of homebake, but that's how we break the wax pill matrix's in NZ. I would speculate that the acetic anhydride may also help free the morphine from the wax, but yeah, it works for us so it should work for you? I'm fairly sure you can also just 'crisp' the powdered pills in a spoon, then extract the morphine from the spoon with water- the wax melts and sticks to the spoon while the morphine sulphate remains water soluble, but I've never not used Baking soda.
Oh and to the above poster- morphine sulphate sucks ass nasally, that is why they use the sulphate form as far as I can see. I once came across some morphine Hydrochloride which was indeed worth snorting. If you could get a bunch of pills (say 1-3g worth, which you bloody americans and your cheap morphine could afford- I'm just bitter) and extract the morphine, it would be fairly simple to convert it from the shitty sulphate to the godlike hydrochloride.
Oral morphine is all about dosage, if you can get a dose that is appropriate for your tolerance (which people often don't do- I need 300mg oral to nod and I have a moderate chipper tolerance, there ain't no oxy/hydro/whatever here. I plug 30mg methadone for fun) oral morphine is moderately euphoric, very sedating and has some legs. Also be aware that if you're abusing ER pills they will get you less high but last longer- when I was taking a lot of morphine orally I would often mix and match for best effect, plug 30mg IR morphine and swallow a 120mg ER, as the initial dose was starting to wear off the ER would be kicking in properly and I'd be able to maintain a plateau much longer.