How is it that Wormtail and others can use other's wands?

[exodusts]

No: HPFGUIDX 147761

fuzz876i
<SNIP>
> What I want to know is this:  how is it possible to use someone 
> else's wand when that wand is supposed to be specific to the owner 
> and backfire if someone else uses it?
> 
> 

I am not sure that there is anything in canon that says wands 
backfire when people other than their owners use them. Judging from 
Neville's attempts to use a secondhand wand, it just makes magic more 
difficult. Thus it might be important for beginning wizards, like 
Harry in PS, to get a wand that is just right for them, to give them 
the best start in wizard-life. According to this Mugglenet Editorial:

http://www.mugglenet.com/editorials/thenorthtower/nt27.shtml

"...it's clear that you can do perfectly good magic with any wand if 
you're a good wizard. Your own wand will allow you those perfect 
results and add an extra touch to your magic perhaps, but it's not 
crucial to have your own, perfect match to do magic in general."

exodusts