A question about Horcruxes

I don't think Dark Magic does work on all Horcruxes-remember that Harry was a living,breathing thing so he was able to die by Avada Kedavra,whilst the other Horcruxes were inanimate objects and had no effect. (Remember how Harry,Ron and Hermione tried nearly every spell they knew and they were still untouched?) But something that totally goes against this is that Voldemort placed a charm on each horcrux to protect them from destruction,but then Harry was killed because Voldemort created the Horcrux within him unintentionally,so he did not offer him protection.So really,who knows? Maybe without protection and charms,Horcruxes may be able to be destroyed by dark magic. (If that made any sense at all xD)

To destroy a Horcrux, you can't just drop it off a tall building or attack it with a hammer. Horcruxes have to be wrecked beyond all magical repair. Few substances are that destructive.
If you recall, Neville killed Nagini by beheading her. The sword, impregnated with basilisk venom, worked.
If the Dark magic in question is extremely destructive, then yes, it could possibly work. However, as Crabbe found out, it is extremely difficult to control such destructive spells. If you are planning on hunting Horcruxes, I recommend you either use basilisk venom or the sword of Gryffindor.
As for Voldemort using the Killing Curse on the bit of soul in Harry, I can only say tghat both of them had wandeed into areas of magic untried and untested. They are a very unusualpair, to say the least. Dumbledore had to use a lot of guesswork in order to figure out the connection. Perhaps even Dumbledore cannot truly answer that.

may be dark magic can destroy..but all of them those who used are with dark lord.probably they didn't have that much dare.
avada kedavra works on only living things so....

I don't think that dark magic can destory Horcruxes... unless it's very advanced, maybe. Horcruxes are very hard to destroy, so it's probably practically impossible.

why, arent u the observent one.......